PASSENGER CAR AND TRUCK IDENTIFICATION - 1985 MODELS

Model and Year: 1985 MODELS

This bulletin has been prepared to assist in identifying 1985 model vehicles and components as described below:

SUBJECT PAGE

Vehicle Identification 2-4

Fisher Body Plate 5

Corvette Body Plate 6

Light Duty Truck Service Parts Identification Sticker 6

1985 Service Parts Identification Label Locations 7

Engines 8-14

Transaxles 15-16

Transmissions 17-33

Axles 34-42

PASSENGER CAR VEHICLE IDENTIFICATION NUMBER

The vehicle identification number is visible through the windshield near the left door. On all pasenger cars, except Corvette, it is stamped on a plate located on the instrument panel. On Corvettes, it is on the left windshield pillar.

LIGHT DUTY (10-30) TRUCK VEHICLE IDENTIFICATION NUMBER

"C/K/G/S" and El Camino trucks display the VIN plate on the left hand side of the instrument panel area. On P 42 models, the plate is attached to the top of the radiator support, and on Motor Home Chassis P 32, to the dash and toe panel.

MEDIUM DUTY TRUCK VEHICLE IDENTIFICATION NUMBER

On Conventional Cabs, the VIN plate is mounted on the left door lock pillar. On School Bus Chassis, the plate is attached to the engine side of the cowl. On "P" models, it is located on top of the radiator support panel.

BODY IDENTIFICATION PLATE

On the Chevrolet, El Camino and Monte Carlo, the body identification plate is located on the upper horizontal surface of the cowl plenum chamber. The Cavalier, Celebrity, Camaro, Citation, and Chevette plate is located on the upper horizontal surface of the radiator support.

CORVETTE BODY PAINT AND TRIM PLATE

The body and trim plate has been replaced by a service parts label located in the left hand compartment behind the drivers seat.

LIGHT DUTY TRUCK SERVICE PARTS IDENTIFICATION STICKER

A Service Parts Identification Sticker is furnished for Light Duty trucks, except El Camino. It contains a complete listing of the vehicle identification number (VIN) wheel base and all production options used to assemble the vehicle, such as suspension, body equipment, engine, axle, transmission, tires, etc.

On "C/K", "G", and "S" models, this sticker is attached to the inner glove compartment. For "P" models, it is mailed separately to the dealer. On "G" models, the sticker is located on the inner hood panel surface.

1984-85 SERVICE PARTS IDENTIFICATION LABEL LOCATIONS

The plants will install Service Parts Identification Labels at the following locations:

Carline Body Style Location -------- ---------- ---------

Celebrity All Exc. Wagon Panel Assembly - Spare Tire Cover

Wagon Left Rear Stowage Compt. - Back Wall

Impala/ All Exc. Wagon Rear Deck Lid - Inner Caprice Classic Wagon Rear Load Floor Cover

Camaro All R.R. Console Compartment Dr.

Monte Carlo All Rear Deck Lid - Inner

Cavalier All Panel Assembly - Spare Tire Cover

Chevette All Panel Assembly - Spare Tire Cover

Citation All Panel Assembly - Spare Tire Cover

Corvette All R.R. Floor Compt. & Door Assembly

Sprint All Panel Assembly - Spare Tire Cover

PASSENGER CAR ENGINE PRODUCTION CODE EXPLANATION

Chevrolet produced engines will be stamped with a source, production date and engine suffix. Other General Motors produced engines used in Chevrolet vehicles will use a label affixed to the engine assembly.

CHEVROLET ENGINE PRODUCTION CODE

Example:

V 12 10 DWB - -- -- --- MONTH DAY ENGINE SOURCE PRODUCED PRODUCED ENGINE CODE

K=GM of Canada 12th Month 10th Day Chevrolet 1.6L F=Flint Motor December (98 CID L4) T=Tonawanda V=Flint Engine M=GM of Mexico A=Ramos - Mexico

ENGINE CODE LOCATIONS

L4 1.6L ------- The code is stamped on a pad on the right side of the engine below the number one cylinder parallel to the cylinder case deck.

L4 2.0L ------- The engine suffix and build date is steel stamped on a horizontal machined surface on the left rear side of the cylinder case under the exhaust manifold.

L4 2.5L ------- The code is on a sticker placed on the rear of the cylinder head and is also stamped on the block, water pump end, just below the cylinder head. This is a three (3) letter alpha-numeric code indicating engine type.

V6 2.8L ------- The code is stamped on a horizontal machined surface on the block just forward of the intake manifold.

V6 4.3L 262 CID --------------- Stamped on cylinder case pad immediately forward of the right cylinder head.

V6 4.3L 262 CID (Diesel) --------------- Label located on rear of L.H. rocker arm cover.

V8 5.7L 350 CID (Diesel) --------------- The code is on a label located on flat surface on L.H. rocker arm cover.

V8 5.0L and 5.7L ----------------- Stamped on cylinder case pad immediately forward of the right cylinder head.

NOTICE: In addition, all passenger car engines will have a portion of the vehicle identification number stamped near the engine production code, usually near the right hand side of the cylinder case. This condensed identification number consists of the division number, model year, assembly plant designation and vehicle build sequence number.

Example:

------- 1 F R 1 2 3 4 5 6 - - - ----------- Chevrolet Model Assembly Vehicle Passenger Year Plant Sequence (VIN Pos. 3) Number

1985 Passenger Engine Codes

FEDERAL AND DISPLACE- HIGH ALT. CALIFORNIA CANADA PRO. VEHICLE MENT R.P.O. AUTO. MAN. AUTO. MAN. AUTO. MAN. DIV. ------- ---- ------ ----- ----- ------ ---- ----- ----- ----- T 1.6L L17 CTA,CTF CTB,CTH CTA,CTF CTB,CTH T4K T4J,T4L CHEV. CHEVETTE CTC,CTJ CTD,CTM CTC,CTJ CTD,CTM T4M T4N 1.8L LJ5 CWC CWC CWC 12 (DIESEL) CHA, J 2.0L L05 CAJ CSH,CSD CAJ CSH,CSD C2L,C2N CHEV. CAVALIER CSC CSE CSC CSE,CHA 2.8L LB6 CAH CAC CAH CAC (MFI)

A 2.5L LR8 AAF ACM AAF ACM AAF ACM PONT. CELEBRITY (TBI) 4.3L LT7 UNC,UND UNL,UNM UNC,UND OLDS 2.8L LE2 CDB CDA CDB CAC CHEV. CBC CBC MEXICO 2.8L LB6(MFI) CAB CAX

X 2.5L LR8 ACC ABY ACC ABY ACC ABY PONT. CITATION 2.8L LE2 CDB,CBC CDA CDB,CBC CDA CHEV. 2.8L LB6(MFI) CAB,CAL CAA,CAK CAB,CAL CAA,CAK CHEV.

F 2.5L LQ9 AAP AAM AAP AAM AAP AAM PONT. CAMARO 2.8L LB6(MFI) CFA CAD CFA CAD CHEV. 5.0L LB9 CFA,CDN CHEV. 5.0L LG4 CDJ CDH CDJ CDH C7A C7B CHEV. 5.0L L69 CDM CFF CHEV.

G Mt. CARLO 4.3L LB4 CLF CCB CLF AND 3.8L LD5 N4A BUICK EL CAMINO 5.0L L69 CDK CFH 5.0L LG4 CDD,CDL CDD,CDL C4R CFF CDF

"B" 4.3L LB4 CLC,CLS CLC,CCC CLC,CCC CHEVROLET CLN,CCC CLN,CLS CLN,CLS CHEV. 5.0L LG4 CKA CKA C4P CHEV. 5.7L LM1 CKB C5P CHEV. POLICE 5.7L LF9 RLA,RLB RLA, RLB OLDS

Y 5.7L L98 ZDF,ZJJ ZJB,ZJK ZJC CHEV. CORVETTE (TPI)

TRUCK ENGINE PRODUCTION CODE EXPLANATION

Chevrolet produced engines, except 6.2L diesel, will be stamped with a source, production date, and engine suffix. Other General Motors produced engines used in Chevrolet vehicles will use a label affixed to the engine assembly.

CHEVROLET ENGINE PRODUCTION CODE

Example:

------- F 12 10 USC - -- -- --- Engine Source Code Month Code Day Code Type

K=GM of Canada 12th Month 10th Day F=Flint Motor T=Tonawanda V=Flint Engine M=GM of Mexico R=Moraine

NOTICE: In addition, all 10-30 Series Trucks have a portion of the vehicle identification number stamped near the engine production code, usually near the right hand side of the cylinder case. This identification number consists of the division code, model year, assembly plant designation and vehicle build sequence number.

EXAMPLE: C C F 1 2 3 4 5 6 - - - - - - - - - The truck engine codes are located as follows:

V6 4.3L 262 CID ---------------- Stamped on cylinder case pad immediately forward of the right cylinder head.

L6 292 CID

The engine suffix and build date is steel stamped on a horizontal machined surface on the right side of the cylinder case adjacent to the distributor shaft.

L4 2.5L -------- The code is on a sticker placed on the rear of the cylinder head and is also stamped on the block, water pump end, just below the cylinder head. This is a three (3) letter alpha-numeric code indicating engine type.

V8

305, 350 CID Engines - the code is stamped on the cylinder case pad immediately forward of the right hand cylinder head.

366, 427, 454 CID Engines - the code is stamped on a pad on the front top center of the cylinder case immediately forward of the inlet manifold.

V8 Diesel

6.2L (379 cu. in.)

Identification label attached to rocker covers.

Example:

------- 10 DJH 5 0004441 -- --- - -------- Engine Suffix Build Assembly Code Plant Sequence

For product reports use suffix, plant code and sequential number, i.e. - DJHR 4441.

L4 1.9L 119 CID ---------------- The code is stamped on the right front corner of the cylinder head mating surface of the block.

V6 2.8L 173 CID --------------- The code is stamped on a horizontal machined surface of the bloc just forward of the intake manifold.

L4 2.2L 136 CID --------------- The code is stamped on a vertical machined surface on the left hand side of the block near the front.

1985 Light Duty Truck Engine Codes

Federal and Displace- High Alt California Canada Pro. Vehicle ment R.P.O. Auto. Max. Auto. Man. Auto. Man. Div. ------- ---- ------ ----- ---- ---- ---- ----- ---- ----

"S" 1.95L LRl FZJ,FZK FZR,FZS FZM,FZN IZU. S-10 TRUCK 2.2L LQ7 UMU FZW IZU. CHEV. 2.5L LN8 ABM ABS ABM ASS ABM ABS PONT. 2.8L LR2 TAG,TAM TAA,TAK TAI,TAT THA CHEV. TBN,TSP TAD THS TAF,TAR

"T" 2.5L LN8 ABM ABS ABM ABS ABM ABS PONT. T-10 TRUCK 2.8L LR2 TAU,TBB TAB,TBC TBH,TAZ TBF,TAY CHEV. TAX,TBD

C-K 4.3L LB1 TUA,TUJ TUB,TUK TUF,TUN TUD,TUM TUA TUB CHEV. 10-30 TUH,TCA TUL,TCD TND TNB TCA,TUJ TCD,TUK LD.TRUCK TWH,TUP TNA,TUL

4.8L L25 TRH,TRA TRJ TRC,TRH TRJ,TRD TRA,TRH TRJ MEX. TRF

5.0L LE9 FCU,TDA FCZ,TDB FCU CHEV. TTF,TTJ TTB,TTH TCN 5.0L LF3 TDD CHEV. 5.7L LS9 FMW,FMJ FMD,THN FMC,FMU CHEV. THW,FMF THP,FMH

5.7L LT9 FMK,FNM FML,FLC FMM,FLB FMR,FLD T8B T8A CHEV. FRS,FMS FNN FMT,FLF FLA FLK

7.4L LE8 TZF,TZG TZA,TZB TZN,TZJ TZC,TZD CHEV. TZK,TZL TZM

6.2L LH6 DHD,DHJ DHB,DHF DHD DHB GMT (DIESEL) DHP

6.2L LL4 DJB,DJH DJE,DJD DJB,DJH DJE,DJD DJB,DJH DJE,DJD GMT DJM,DJA DJF,WC DJM DJF,DJC DJM DJF,DJC DJG,DJN DJK,DJJ DJS

MILITARY 6.2L LH6 DJA DJA DJA

"G" 6.2L LH6 DHX,DNY DHM,DHK DHX,DHW DHM,DHK GMT 10-30 Van DHW DHN 5.0L LE9 FCW,TTP TTS,TTR CHEV FCY,FCX 5.0L LF3 FDW CHEV

4.3L LB1 TCB,TNF TUT,TUX TWS,TNK TUU,TUW TCB,TNF TUT,TNG CHEV TUR,TWA TUY,TNG TNH,TNJ TUR,TUS TWT,TUS TWB,TWC TUZ TUZ 5.7L LS9 FMA,THZ FMB CHEV

5.7L LT9 FNA,FLH FNB,FLJ TBC CHEV FRT,FNC FND

6.2L LL4 DFN,DHT DHT,DHS DHT,DHS DDA DHS,DHZ

"P" 5.7L LT9 FRU,FNH FNF,FLM FNS,FNK FNR,FNJ CHEV 20-30 FLN FLT FND,FLS FLR,FLL LD.TRUCK FLW

6.2L LL4 DJX,DJZ DJT,DJW DJX DJT,DJU DJX DJU,DJT DDA DJU

7.4L LE8 TZF,TZG TZA,TZB TZH,TZJ TZC,TZD CHEV TZK,TZL TZM

4.8L L25 TRT,TRN TRM,TRU TRR,TRN TRS,TRM TRN,TRT TRM,TRU MEX

"M" 2.5L LN8 AAL AAK AAL AAK AAL AAK PONT VAN 4.3L LB1 TCC,TWD TCF,TWF TNM TNL TCC TCF CHEV

1985 MEDIUM DUTY TRUCK ENG. CODES ---------------------------- ALL STATES CANADA ENG. AUT. MAN. AUT. MAN. MAN. ---- --- --- --- --- ----- 7.0L ACAA ACFF A8FF A8DD CHEV. L-43 ACBB A8HH

6.0L AAUU, AAWN AAXX A8BB A8AA CHEV. L-86 AAKK, AATT AAMM A8CC

5.7L AFB,AFD AFA, AFC, AFL T5H,T5K T5D,T5F CHEV. LF5 AJA, ARB AJN, AJP, AJD T5U, T5X T5J. T5S ARD, AFH, AJS AJF, ARA, ARC T5T, T5W AJU, AJC, AJJ AFF, AJR, AJT AJM AJB, AJK, AJH

TRANSAXLE ASSEMBLY IDENTIFICATION INFORMATION

The manual and automatic transaxle each has its own code location and explanation.

MANUAL TRANSAXLE

Four Speed 76mm

The code is stamped on a diagonal case surface directly beneath the clutch lever cable reaction bracket.

The Muncie 76mm stamp consists of two (2) alpha and three (3) numeric characters as shown below:

Example:

-------- X 5 A 04 - - - -- Mfg. Source Calendar Code Model Year Month Produced Day Produced

X = Muncie 5=1985 A=Jan. K=July 01 = lst Day B=Feb. M=Aug. of Month C=Mar. P=Sept. D=Apr. R=Oct. 04 = 4th Day E=May S=Nov. of Month J=June T=Dec.

AUTOMATIC TRANSAXLE

THM 125C Three Speed Automatic

The code is located on a stamped metal tag adjacent to the shifter shaft on the transaxle.

The stamp is one of two formats as shown below, depending on manu- facturing location:

Willow Run, U.S.A. ------------------ 85 CV 8711 -- -- ---- Model Year Vehicle Application Sequence Code Number

Windsor, Canada

J 222 A 5CB - --- - --- Source Julian Shift Model Number (Windsor) Build Date

THM 125/125C ------------- The THM 125/125c transmission is built at Ypsilanti, MI and Windsor, Canada. Transmissions built at Ypsilanti, MI use serial numbers; and beginning 1985 model year, Julian dates have been added to the nameplate. Transmissions built at Windsor, Canada use Julian dates. However, the transmission identification tag location is the same.

PASSENGER CAR TRANSMISSION PRODUCTION CODE EXPLANATION

Manual Transmissions

Four-speed transmissions built at Chevrolet plants will carry a production code number. The code number identifies the source, model year, month and day produced.

The transmission codes are located as follows:

Four-Speed

The Muncie (cast iron case) transmission (Saginaw type) is stamped on the machined surface of the left side of the case just below the side cover.

The Muncie 70mm (aluminum case) transmission is stamped on the bottom center front of case.

Example:

------- K 5 R 08 - - - -- Model Month Day Source Code Year Produced Produced ----------- ---- --------- -------- K=Muncie (Chevette, 70mm A=January 4-Speed) B=February C=March D=April E=May H=June R=Muncie (Passenger 4-Speed K=July Saginaw Type) M=August P=September R--October S=November T=December

Warner Gear Four and Five Speed Manual Transmissions

The manual transmission code, part number, and serial number, appears on a metal tag attached to an extension housing bolt on the left side (9 o'clock position).

Example Tag:

Customer P/N 14078525 WA2041 Source Code

Source P/N 13-52-062 21975 Sequential Serial Number Example: ------- W A 20 5 1 - - -- - - Shift Source Code Month Day Year Code

W = Warner A=Jan. G=July 20=20th Day 5=1985 Shift B=Feb. H=Aug. Produced C=Mar. J=Sept. D=Apr. K=Oct. E=May L=Nov. F=June M=Dec.

Four-Speed Manual With Automatic Overdrive (Doug Nash) MK2

Source trademark appears above speedo gear opening.

The Doug Nash transmissions have the source code, calendar year, and month, unit serial number and ratio identification stamped on two (2) metal tags. One (1) tag is attached to the T-10 transmission side cover lower bolt, and the other tag is on the overdrive pan front bolt.

Example: (Overdrive) D 4 C 25 037 - CD

D 5 C 6037 C F - - - ---- - - Source Code Year Month Serial Number Ratio P/N ----------- ---- ----- ------------- ----- --- D=Doug Nash 5=1985 A=Jan. 6037=6037th B=Feb. Unit Built C=Mar. D=Apr. E=May F=June G=July H=Aug. J=Sept. K=Oct. L=Nov. M=Dec.

The tag on the T-10 transmission has an additional code.

Automatic Transmissions

THM 180C Automatic Transmission

The THM 180C automatic transmission code and transmission serial number appears on a metal tag fastened to the left side of the transmission just rearward of the converter housing.

THM 200C Automatic Transmission

The identification tag is located on the right side of the transmission case and includes the model year, application code and sequence number.

Example:

85 OU 6991 -- -- ----- Vehicle Model Year Application Code Sequence Number

THM 200-4R Automatic Transmission

The identification tag is located on the right side of transmission case and includes the model year, application code, build date code and the sequence number.

Example:

85 BY 201 0346 -- -- --- ---- Vehicle Build Date Sequence Model Year Application Code Code Number

Example:

B 4 D 10 D - - - -- -

Model Month Day Shift Source Code Year Produced Produced Produced ----------- ---- -------- -------- -------- B=Parma (THM 350C) 1985 A=Jan. 10th Day D=1st B=Feb. N=2nd C=March D=April E=May H=June K=July M=Aug. P=Sept. R=Oct. S=Nov. T=Dec.

THM 350C Automatic Transmissions

THM 350C transmisSions produced by Chevrolet Parma has the production code stamped on the governor cover.

THM 400

The THM 400 transmission uses serial numbers; and beginning 1985 model year, Julian dates have been added to the nameplate.

THM 440-T4 Four Speed Automatic

The code is located on a stamped metal tag on the rear face of the transaxle case adjacent to right hand axle opening.

An example of the identification tag is shown below:

THM 700-R4 Automatic Transmission

The identification number is stamped into right rear oil pan rail. The format includes the year, model, Julian build date, shift, and line.

Example:

5 YC 222 A C - -- --- - - Model Julian Year No. Build Date Shift Line ---- --- ---------- ----- ---- A&B First A&C North C&H Second B&H South

PASSENGER CAR TRANSMISSION IDENTIFICATION NUMBER FOR "SERVICE" USAGE --------------------

The following system will be used to identify service transmission assemblies. This number system applies to domestically produced complete service transmission assemblies only. Transmission cases are no longer identified. Manufacturing plants will number each service assembly as it is produced. The first letter will designate the GM division which produced the unit - "C" (Chevrolet) . The second letter will indicate the type of unit "T" (transmission) . The number following the letter will designate the model year - "5" (1985). The last five (5) digits specify the service replacement sequence number. The group of numbers to be used by Chevrolet Manufacturing plants are as follows:

Plant Serial Sequence ----- --------------- Chevrolet - Parma Transmission Plant 00001 to 14999

Chevrolet - Muncie Transmission Plant 25000 to 44999

Example: Number CT-500175 designates Chevrolet transmission, year and 175th unit produced for service at Parma.

Upon completion of the serial sequence, the plant will reuse the above numbers using a letter prefix, such as A, B, and C.

Example: CT5AOO175

Hydra-Matic Division 00001 to 99999

Hydra-Matic Division transmissions will be numbered with the letter "H" regardless of the GM division using the transmission.

1985 PASSENGER CAR TRANSMISSION PROGRAM SUMMARY ---------------

PROCESSING NUMBER ------ MANUAL 4 SPEED

MH5 2.88:1 First Gear Ratio - Automatic Overdrive Doug Nash MK2 2.88:1 First Gear Ratio - Automatic Overdrive Doug Nash M17 3.31:1 First Gear Ratio, Transverse Muncie MX6 3.31:1 First Gear Ratio, Transverse Muncie M19 3.53:1 First Gear Ratio, Transverse Muncie MY8 3.53:1 First Gear Ratio, Transverse Muncie MY1 3.75:1 First Gear Ratio Muncie

MANUAL 5-SPEED

MB1 4.03:1 First Gear Ratio Borg Warner M39 2.95:1 First Gear Ratio Borg Warner ML3 3.76:1 First Gear Ratio Borg Warner MB4 3.76:1 First Gear Ratio Borg Warner M75 3.79:1 First Gear Ratio Isuzu MY7 3.91:1 First Gear Ratio, Transverse Isuzu

AUTOMATIC 3-SPEED

MD9 125c, Converter Clutch, Transverse Willow Run - Hydra-matic MD2 180c, Converter Clutch Strausbourg MV9 200c, Converter Clutch Willow Run - Hydra-matic MV4 350c, Converter Clutch Parma

AUTOMATIC 4-SPEED

MW9 200-4R, Converter Clutch and Overdrive 3 Rivers - Hydra-matic ME9 440-T4, Converter Clutch and Overdrive, Warren - Hydra-matic Transverse MD8 700-R4, Converter Clutch and Overdrive Toledo - Hydra-matic

TRUCK TRANSMISSION PRODUCTION CODE EXPLANATI ON -------------------------------------------- --

Muncie Manual Transmission Production Code Explanation

The production code number contains the source code, model year, and build date.

Example:

N 5 D 10 Source Date Model Year Build Month Day Code ------------ ---------- ----------- -------- S - 3 speed 1985 A=Jan. 10th (Saginaw Type) B=Feb. C=March D=April N - 4 Speed E=May (117mm) H=June K=July M=Aug. P=Sept. R=Oct. S=Nov. T=Dec.

3 Speed (Saginaw Type)

The code is stamped on the left side of the case just below the side cover.

Muncie Truck 4 Speed

Stamped on the rear face of the transmission case just below the rear retainer.

New Process 205, 207, and 208 4-Wheel Drive Transfer Case

The build date showing the month, day, and year along with Chevrolet part number, is on a metal tag attached to the front face of the transfer case at PTO cover.

Warner Gear Four and Five-Speed Manual Transmissions

The manual transmission code, part number and serial number, appears on a metal tag attached to an extension housing bolt on the left side (9 o'clock position).

Example Tag:

Customer P/N 14078525 WA2041 Source Code

Source P/N 13-52-062 21975 Sequential

Example:

W A 20 5 1 - - -- - -

Shift Source Code Month Day Year Code ------------ ----- --- ---- ---- W = Warner A=Jan. G=July 20=20th Day 5-1985 Shift B=Feb. H=Aug. Produced C=Mar. J=Sept. D=Apr. K=Oct. E=May L=Nov. F=June M=Dec.

Truck Four-Speed Isuzu Transmission (77.5mm) -------------------------------------------- Right side of bell housing at 3:00 o'clock position five (5) digit ink stamp transmission serial number. Below serial number is five (5) digit date stamp.

350C and 700-R4 Turbo Hydra-Matic Transmissions

Refer to the passenger section of this bulletin for production code explanations.

400-475 Model Turbo Hydra-Matic Transmission

The transmission model number and sequence number is stamped on the identification plate located at the right rear extension.

Model and Sequence Number Example:

5 GM 5223 - -- ----

Model Year Vehicle Application Code Sequence Number

TRUCK TRANSMISSION INDENTIFICATION NUMBER FOR "SERVICE" USAGE

The following system will be used to identify service transmission assemblies domestically produced. This number system applies to complete service transmission assemblies only. Transmission cases are no longer identified. Manufacturing plants will number each service assembly as it is produced. The first letter will designate the GM division which produced the unit - "C" (Chevrolet). The second letter will indicate the type of unit - "T" (transmission). The number following the letter will designate the model year - "5" (1985). The last five (5) digits specify the service replacement sequence number. The group of numbers to be used by Chevrolet Manufacturing plants are as follows:

Plant Serial Sequence ----- ----------------- Chevrolet - Parma Transmission Plant 00001 to 14999

Chevrolet - Muncie Transmission Plant 25000 to 99999

Hydra-Matic 00001 to 99999

Hydra-Matic transmissions will be numbered with the letter "H" regardless of the Gm division using the transmission.

Example: Number CT500175 designates Chevrolet transmission, year, and 175th unit produced for service at Parma.

Upon completion of the serial sequence, the plant will reuse the above numbers using a letter prefix, such as A, B, or C to indicate late production transmission; for example: CT 2AOOO1.

1985 TRUCK TRANSMISSION PROGRAM SUMMARY --------------- PROCESSING NUMBER

MANUAL 3-SPEED

M62 2.85 - 1 First Gear Ratio Muncie M64 3.50 - 1 First Gear Ratio Muncie

MANUAL 4-SPEED

MY6 3.09:1 First Gear Ratio, Overdrive New Process M20 6.55:1 First Gear Ratio Muncie M73 4.09:1 First Gear Ratio Isuzu M77 4.07:1 First Gear Ratio Borg Warner

MANUAL 5-SPEED

MB1 4.03:1 First Gear Ratio, Overdrive Borg Warner MB6 4.03:1 First Gear Ratio, Overdrive Borg Warner

AUTOMATIC 3-SPEED

MV9 200C, Converter Clutch Willow Run - Hydra-matic MV4 350C, Converter Clutch Parma M40 400 Willow Run - Hydra-matic M40 475 Willow Run - Hydra-matic

AUTOMATIC 4-SPEED

MD8 700-R4, Converter Clutch, Overdrive Toledo - Hydra-matic

PASSENGER CAR REAR AXLE IDENTIFICATION (EXCLUDING CORVETTE) -------------------- Axles are manufactured by Chevrolet Buffalo, Chevrolet Gear & Axle, Oldsmobile, and GM of Canada (McKinnon). Divisional Manufacturer code letters will be metal stamped on the axle tube adjacent to the carrier for field identification (see example). Letters and numerals 1/4" high are metal stamped on right front inboard side, 3" outboard of carrier or are located on a metal tag attached to cover bolt.

FIELD IDENTIFICATION

8JA C 218 1 --- - --- - Manufacturer Day of 1 - For Day Shift Axle Code Identity Year Built 2 - For Night Shift

MANUFACTURER IDENTITY

O - Oldsmobile G - Chevrolet Gear & Axle C - Chevrolet Buffalo K - GM of Canada, St. Catharines (McKinnon)

1985 CORVETTE AXLE IDENTIFICATION CODES

Model 36 Model 44 ---------- -------- P/N Code Ratio P/N Code Ratio --- ---- ----- --- ---- ----- 14087675 5YN 2.73 14087652 5YX 3.07 (Z-51)

14087676 4YJ 3.07 (Z-51) 14084122 5YB 3.07

14087678 4YL 3.07

CORVETTE REAR AXLE IDENTIFICATION

Axles are manufactured by Dana and consist of a Model 36 (7 7/8" ring gear) for automatic transmission vehicles and a Model 44 (8 1/2" ring gear) for manual transmission vehicles. Axles are identified by part number, axle code, ratio, and date code etched on upper surface of the differential carrier.

1985 AXLE IDENTIFICATION CODES "F" SERIES (*INDICATES POSITRACTION)

3.08 Ratio 3.23 Ratio 3.42 Ratio 3.73 Ratio ----------- ---------- ---------- ---------- Ring Ring Ring Ring Code Gear Code Gear Code Gear Code Gear ---- ---- ---- ---- ---- ---- ---- ---- 8JA 7.625 8JB 7.625 8JC 7.625 8JD 7.625 8KR 7.625 *8JQ 7.625 8KA 7.625 8KB 7.625 *8JP 7.625 *8PQ 7.625 *8PR 7.625 *8PS 7.625 *8PP 7.625

1985 AXLE IDENTIFICATION CODES "T" SERIES (*INDICATES POSITRACTION)

3.36 Ratio 3.62 Ratio ------------- ------------- Ring Ring Code Gear Code Gear ---- ---- ---- ---- TA 6.50 TB 6.50

1985 AXLE IDENTIFICATION CODES "G" SERIES (*INDICATES POSITRACTION)

2.29 Ratio 2.41 Ratio 2.56 Ratio 2.73 Ratio 3.08 Ratio 3.73 Ratio ---------- ----------- ---------- ---------- ---------- ---------- Ring Ring Ring Ring Ring Ring Code Gear Code Gear Code Gear Code Gear Code Gear Code Gear ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- 8AH 7.50 8AJ 7.50 8AY 7.50 8AB 7.50 8AC 7.50 5TF 7.625 *8BH 7.50 *8BJ 7.50 *8BY 7.50 *8BB 7.50 *8BC 7.50 *5TH 7.625 8AZ 7.50 8AX 7.50 8AV 7.50 *8BZ 7.50 *8BX 7.50 *8BV 7.50

1985 AXLE IDENTIFICATION CODES "B" SERIES (*INDICATES POSITRACTION)

2.41 Ratio 2.56 Ratio 2.73 Ratio 2.83 Ratio ----------- ----------- ------------ ------------- Ring Ring Ring Ring Code Gear Code Gear Code Gear Code Gear ---- ---- ---- ---- ---- ---- ----- ---- 8GL 7.50 8GM 7.50 8GN 7.50 8GP 7.50 8FN 7.50 *8NP 8.50 *8NV 8.50 *8NW 8.50 *8NU 8.50 *8YP 8.50 *8YQ 8.50 *8DU 8.50 8YB 8.50 8YC 8.50 *8YX 8.50 *8YK 8.50

3.08 Ratio 3.23 Ratio ----------- ----------- Ring Ring Code Gear Code Gear ---- ---- ---- ----

8LG 8.50 BLH 8.50 *8NX 8.50 *8NY 8.50 8ZE 8.50 8YE 8.50 *8ZV 8.50 *8YS 8.50 8YD 8.50 *8YR 8.50

LIGHT DUTY TRUCK REAR AXLE IDENTIFICATION

Chevrolet Light Duty Trucks use either Chevrolet, Dana, or Rockwell produced rear axle assemblies. See examples of production codes below:

CHEVROLET AXLE

Example:

BN3 G 001 1 --- - --- -

Axle Code Source Code Day Code Shift Code ---------- ----------- --------- ---------- C = Buffalo Jan. 1 = 001 1st Shift G = Gear & Axle

Code is stamped on top of right axle tube outboard of carrier.

DANA AXLE

Example:

603560-1 9 29 5 B 4 -------- - -- - - -

DANA MONTH DAY MODEL SHIFT PRODUCTION P/N CODE CODE YEAR CODE LINE CODE ----- ---- ---- ---- ---- ----------

Code is stamped on rear surface of right axle tube.

The Chevrolet produced axles use a prefix code stamped into the axle tube for axle code identification. Dana produced axles use the same prefix code as the Chevrolet axles, but they display these codes on a strip of tape attached to the outboard end of the axle tube.

1985 "C" 10-30 REAR AXLE IDENTIFICATION

STD. AXLE L/D AXLE AXLE BRAKE GEAR AXLE MODEL CODE CODE RATIO SIZE DIA. RATING MFR. ----- ---- ---- ----- ---- ---- ------ ---- C100 BN3 - 2.56 11 x 2 8.5 3750 DETROIT G & A BR3 CC3 2.73 BS3 CD3 3.08 BT3 CF3 3.42 BU3 BFH 3.73

BW3 - 2.56 11.15 x 2.75 BX3 CJ3 2.73 BY3 AZ3 3.08 BZ3 BA3 3.42 CA3 BFJ 3.73

C100 CK3 CS3 2.73 11 x 2 V8 + CM3 CT3 3.08 M20 BJK BFM 3.73

CN3 CU3 2.73 11.15 x 2.75 CR3 CW3 3.08 HBR HBS 3.42 BFN BFR 3.73 C20903 BDB - 3.23 11.15 x 2.75 9.5 5700 BBJ BBF 3.42 BCY BFC 3.73 BCZ BJA 4.10 C20903 BDC - #3.23 13 x 2.50 6000 20906 BBK BBH 3.42 (EXC BFA BDA 3.73 LE8) BJC BJB 4.10 BKC BKD 4.56 (W/LE8) GMA - 3.21 10.5 GMB GMC 3.73 GMD GMF 4.10 C20943 GMG - 3.21 7500 GMH GMJ 3.73 GMK GML 4.10 GMM GMN 4.56

C30903 GGF - *3.21 13 x 3.50 30943 GGG GGP 3.73 31003 GGH GGR 4.10 31403 GGJ GGT 4.56

C31003 GGK - cts3.21 DETROIT G & A 31403 GGL GGO 3.73 DUAL WHEEL 30943 GGM GGW 4.10 GGN GGX 4.56

C30903 GLH GLK 3.73 DETROIT G & A 30943 GLJ GLM 4.10 DUAL WHEEL GLL GLN

# 3.23 RATIO NOT AVAILABLE ON C20906

* 3.21 RATIO NOT AVAILABLE ON C30943

1985 'K' 10-30 REAR AXLE IDENTIFICATION ---------------------------------------

STD. AXLE L/D AXLE AXLE BRAKE GEAR AXLE MODEL CODE CODE RATIO SIZE DIA. RATING AXLE MFR. ----- ---- ---- ----- ---- --- ------- ---------- K100 BB3 BH3 2.73 11.15 x 2.75 8.5 3750# DETROIT G & A BC3 BJ3 3.08 EX 06 BD3 BK3 3.42 4000# BF3 BM3 3.73

K100 BRA BRB 2.73 V8 + BSA BSB 3.08 M20 CX3 CZ3 3.42 CY3 DA3 3.73

K20903 BDD - 3.23 9.5 5700 BBC BBA 3.42 BCW BFD 3.73 GDL GDK 4.10

BDF - 3.23 13 x2.50 6000

K20903 BBD BBM 3.42 20906 BCX BFF 3.73 BHK BJD 4.10

K30903 GGY GHF 3.73 13 x 3.50 10.5 7500 30943 GGZ GHG 4.10 31003 GHA GHH 4.56 K30943 GHB GHJ 3.73 DETROIT G & A 31003 GHC GHK 4.10 DUAL WHEEL 314003 GHD GHL 4.56 K30903 GLH GLK 3.73 DETROIT G & A 30943 GU GLM 4.10 DUAL WHEEL GLL GLN 4.56 WIDE TRACK

1985 "G" 10-30 REAR AXLE IDENTIFICATION

STD. AXLE L/D AXLE AXLE BRAKE GEAR AXLE MODEL CODE CODE RATIO SIZE DIA RATING MFR. ----- ---- ---- ----- ---- ---- ------ ---- G100 BRC BRF 2.73 11 x 2 8.5 3500# DETROIT G & A BSC BSF 3.08 BBN BBS 3.42 BFU BFX 3.73

G100 BRD BRH 2.73 11.15 x 2.75 G2DO BSD BSH 3.08 BBR BBT 3.42 BFW BFY 3.73

G31305-6 HHB HBC 3.73 13x 2.50 9.5 5700 31303-32 HBD HBF 4.10

G31303-6 HBG HBH 3.23 31332

G31303 HBJ HBK 4.56 31332 GLP - 4.10 13 x 3.50 9.75 6200 GLR - 4.56 DETROIT G & A DUAL WHEELS G31603 GLS - 4.10 31632 GLT - 4.56

G31303 GLU GLX 4.10 10.5 7500 31603 GLW GLY 4.56 31632

1985 S-T 10 REAR AXLE IDENTIFICATION

STD. AXLE L/D AXLE AXLE BRAKE GEAR MODEL CODE CODE RATIO SIZE DIA. RATING AXLE MFR. ----- ---- ---- ----- ---- ---- ------ ----------

S100 GNH GNS 3.08 9.5x 2 7.5 2600 BUFFALO G & A GNM GNX 3.08 GNJ GNT 3.42 GNN GNY 3.42 GNK GNU 3.73 GNP GNZ 3.73 GNL GNW 4.11 GNR GNA 4.11

T100 HCC HCG 3.42 2700 HCB HCF 3.73 HCA HCD 4.11

1985 M-VAN REAR AXLE IDENTIFICATION

STD. AXLE LE L/D AXLE BRAKE GEAR MODEL CODE DE RATIO SIZE DIA. RATING AXL.MFR. ----- ---- -- ----- ---- ----- ------ --------- M10905 FSA D 4.11 9.5 7.5 2900 BUFFALO G & A M10905 FAA A 2.56 M10906 FCA B 2.73 FFA B 3.08 FMA B 3.42 FRA B 3.73

1985 "P" 20-30 REAR AXLE IDENTIFICATION

STD. AXLE L/D AXLE AXLE BRAKE GEAR AXLE MODEL CODE CODE RATIO SIZE DIA RATING MFR. ----- ---- ---- ----- ---- --- ------ ----

P20842 BYC BFC 3.73 11.15 x 2.75 9.5 5700 DETROIT G & A 21042 BCZ - 4.10

BFA BDA 3.73 13 x 2.50 6000 BJC - 4.10

P30842 GMP GMR 3.73 10.5 7900 31042 GMS - 4.10 31442 GMT GMU 4.56

GMW GMX 3.73 13 x 3.50 GHM 4.10 GHN GHP 4.56 P30842 GHR - 4.10 DETROIT G & A 31042 GHS GHT 4.56 DUAL WHEEL 31442 GHU 5.13* 31842 30832 31132 31432 31832 P30842 GNA 5.29 13.75 x 1.53 12.0 11000 ROCKWELL 31042 DISC DUAL WHEEL 31442 P31432 GMB 4.56 10.5 10000 DANA 31832 GNC 4.88 DUAL WHEEL GND 5.13

*5.13 RATIO AXLE NOT AVAILABLE ON MOTOR HOME CHASSIS 032 MODELS.

LIGHT DUTY TRUCK FOUR WHEEL DRIVE FRONT AXLE IDENTIFICATION ------------------- Chevrolet Light Duty Trucks use either Chevrolet or Dana produced front axle assemblies. Production code explanations are similar to those covered under rear axle identification.

CHEVROLET AXLES

Code is stamped on top rear section of left axle tube. (Includes axle ratio code.)

DANA AXLES

Code is stamped on forward side of left axle tube. Axle ratio code on tape strip around right axle tube.

1985 "K" 10-30 FRONT AXLE IDENTIFICATION

AXLE CODE MANUAL AUTO. HUB HUB AXLE BRAKE GEAR AXLE MODEL LOCKS LOCKS RATIO SYSTEM DIA. RATING AXLE MFR. ----- ----- ----- ----- ------ ---- ------ ---------

K100 GPR GPP 2.73 JB/D5 8.5 3600 DETROIT G & A GPT GPS 3.08 GRD GRB 3.42 GRS GRP 3.73

K200 GPY GPX 3.23 JB/D6 3800 GRF GAC 3.42 GRT GRR 3.73 GRY GRX 4.10

K200 HD GPW GPU 3.23 JB/D7 GRA GPZ 3.42 GRN GRG 3.73 GRW GRU 4.10 K300 TBA 3.73 JB/D8 9.75 4500 DANA SINGLE TCA 4.10 WHEEL TDA 4.56 K300 TBB 3.73 DUAL TCB 4.10 WHEEL TDB 4.56

*K300 ASSEMBLIES DO NOT INCLUDE HUB LOCKS.

"T" 10 FRONT AXLE IDENTIFICATION

MODEL AXLE CODE AXLE RATIO GEAR DIA. AXLE MFG. ----- --------- ---------- --------- ---------- T100 GBD 3.42 7.25 DETROIT G & A GBF 3.73 GBG 4.11

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.