CAMPAIGN: STEERING GEAR ARM (CONTROL ARM MAY FAIL)

Subject: PRODUCT SAFETY CAMPAIGN 85C26 STEERING CONTROL ARM MAY FAIL

Model and Year: 1982 - 1985 CHEVROLET C70 MEDIUM DUTY CONVENTIONAL MODEL TRUCKS EQUIPPED WITH 8.2L DIESEL ENGINES (RPO LH3 & LH4) AND COLEMAN FRONT DRIVE AXLES SEO IFVQ 12,000 LB. CAPACITY OR IFVZ 9,000 LB. CAPACITY AND AIR BRAKES (RPO JE4) OR HYDRAULIC BRAKES (RPO JE3)

The National Traffic and Motor Vehicle Safety Act, as amended, provides that each vehicle which is subject to a recall campaign of this type must be adequately repaired within a reasonable time after the owner has tendered it for repair. A failure to adequately repair within 60 days after tender of a vehicle is prima facie evidence of failure to repair within a reasonable time.

If the condition is not adequately repaired within a reasonable time, the owners may be entitled to an identical or reasonably equivalent vehicle at no charge or to a refund of the purchase price less a reasonable allowance for depreciation.

To avoid having to provide these burdensome solutions, every effort must be made to promptly schedule an appointment with each owner and to repair their vehicle as soon as possible. As you will see in reading the attached copy of the letter which is being sent to owners, the owners are being instructed to contact the nearest Chevrolet Zone Office if their dealer does not remedy the condition within five days of the mutually agreed upon service date. If the condition is not remedied within a reasonable time, they are instructed on how to contact the National Highway Traffic Safety Administration.

DEFECT INVOLVED

General Motors has determined that a defect which relates to motor vehicle safety exists in some 1982-1985 Chevrolet C70 Medium Duty Conventional Model Trucks equipped with either a 9,000 lb. (IFVZ) or a 12,000 lb. (IFVQ) American Coleman front drive steering axle and an 8.2L Detroit Diesel engine (RPO LH3/LH4), and equipped with air brakes (RPO JE4) or hydraulic brakes (RPO JE3).

In some instances of heavy steering input, steering arms can be over stressed resulting in cracks and eventual complete failure of the steering control arm. When this condition occurs, there will be a complete loss of steering ability leading to a loss of vehicle control and a vehicle crash can occur without prior warning.

VEHICLES INVOLVED

The vehicles involved are certain 1982 - 1985 Chevrolet C70 Medium Duty Trucks equipped with either a 9,000 lb. (IFVZ) or a 12,000 lb. (IFVQ) American Coleman front drive steering axle and an 8.2L Detroit Diesel engine (RPO LH3/LH4) and equipped with air brakes (RPO JE4) or hydraulic brakes (RPO JE3), built within the following breakpoints:

PLANT YEAR FROM THROUGH --------- ------ -------- -------- Pontiac 1982 CV123416 CV138146 Pontiac 1983 DV106387 DV135045 Pontiac 1984 EV103212 EV144349 Pontiac 1985 FV110900 FV216377

Involved vehicles have been identified by Vehicle Identification Number Computer Listings. Computer listings contain the complete Vehicle Identification Number, owner name and address data, and are furnished to the involved dealers with the campaign bulletin. Owner name and address data furnished will enable dealers to follow-up with owners involved in this campaign.

These listings may contain owner names and addresses obtained from State Motor Vehicle Registration Records. The use of such motor vehicle registration data for any other purpose is a violation of law in several states. Accordingly, you are urged to limit the'use of this listing to the follow-up necessary to complete this campaign. Any dealer not receiving a computer listing with the campaign bulletin has no involved vehicles currently assigned.

OWNER NOTIFICATION

Owners will be notified of this campaign on their vehicles by Chevrolet Motor Division (see copy of Owner Letter included with this bulletin).

DEALER CAMPAIGN RESPONSIBILITY

Dealers are to service all vehicles subject to this campaign at no charge to owners, regardless of mileage, age of vehicle, or ownership, from this time forward.

Whenever a vehicle subject to this campaign is taken into your new or used vehicle inventory, or it is in your dealership for service in the future, you should take the steps necessary to be sure the campaign correction has been made before reselling or releasing the vehicle.

Owners of vehicles recently sold from your new vehicle inventory are to be contacted by the dealer, and arrangements made to make the required modification according to instructions contained in this bulletin.

SERVICE INFORMATION

Repairs for this campaign are covered by three (3) procedures (which we have attached to this bulletin) and three (3) parts kits. Following is an index of the bulletin repair procedures and required parts kits:

SECTION I: 12,000 lb. Front Axle SEO IFVQ Equipped with Air Brakes JE4

P/N 15556771 Service Parts Kit Required.

SECTION II: 9,000 lb. Front Axle SEO IFVZ Equipped with Air Brakes JE4

P/N 15556769 Service Parts Kit Required.

SECTION III: 9,000 lb. Front Axle SEO IFVZ Equipped with Hydraulic Brakes JE3

P/N 15559733 AND P/N 15556769 Parts Kits Required.

PARTS INFORMATION

Parts required to complete this modification are to be obtained from General Motors Warehousing and Distribution Division (GMWDD). To ensure these parts will be obtained as soon as possible, they should be ordered from GMWDD on a C.I.O. order with no special instruction code, but on an advise code (2).

QUANTITY PART NO. DESCRIPTION PER VEHICLE -------- ---------------------------------- ----------- 15556771 Service Kit for 12,000 lb. Capacity 1 Coleman Front Axle SEO IFVQ Equipped with Air Brakes RPO JE4

Service Kit 15556771 consists of the following listed items:

15556772 Instructions 1 15553587 Steering Arm 1 9423996 Bolt - Strg Arm - Upper Position 2 9423998 Bolt - Strg Arm - Lower Position 2 9422302 Nut - Strg Arm - Lower Position 2 15556652 Cylinder - Hyd Strg 1 15556653 Hose - Hyd Strg Cyl - LH Turn 1 15556654 Hose - Hyd Strg Cyl - RH Turn 1 2404058 Cover - Dust 1 94111010 Fitting - Lube 2 103389 Cotter Pin - Adjuster Screw 1 103388 Cotter Pin - Socket Asm Nut/Strg 2 Conn Rd 15559775 Socket Asm - Hyd Strg Cyl Ball 1

15556769 Service Kit for 9,000 lb. Capacity 1 Coleman Front Axle SEO IFVZ Equipped with Air Brakes RPO JE4 or Hydraulic Brakes RPO JE3

Service Kit 15556769 consists of the following listed items:

15556770 Instructions 1 15553587 Steering Arm 1 9423996 Bolt - Strg Arm - Upper Position 2 9423998 Bolt - Strg Arm - Lower Position 2 9422302 Nut - Strg Arm - Lower Position 2 7842831 Gear - Strg 1 11501755 Bolt - Strg Gear to Frm 3 2436167 Washer - Strg Gear to Frm 6 11501034 Nut - Strg Gear to Fram Bolt/Pitman 4 Arm Pinch Bolt 7837025 Shaft - Strg 1 7809381 Clamp - Coupling 1 7809553 Bolt - Coupling Clamp 1 9422298 Nut - Coupling Clamp Bolt 1 718522 Arm - Pitman 1 11501756 Bolt - Pitman Arm Pinch 1 2040951 Washer - Pitman Arm Pinch Bolt 1 718796 Rod - Strg Conn 1 9411010 Fitting Lube 4 15556652 Cylinder Hyd Strg 1 2069292 Tube Air Brake 1 2404058 Cover Dust 1 103389 Cotter Pin - Hyd Strg Cyl Adj Plug 1 15559775 Socket Asm - Hyd Strg Cyl Ball 1 103388 Cotter Pin - Socket Asm Nut/Strg 3 Conn Rod

2474888 Bracket - Hyd Strg Cyl 1 9423369 Bolt - Hyd Strg Cyl Brkt 3 2456908 Washer - Hyd Strg Cyl Brkt 3 9422301 Nut - Hyd Strg Cyl Brkt Bolt 3 2075152 Tube & Hose - Hyd Strg Pump Outlet 1 12040575 Loom - Power Steering Outlet Tube 1 & Hose 2049226 Clamp - Pump Outlet Tube 1 2044321 Clamp - Pump Outlet Tube 1 2064951 Tube - Hyd Strg Gear Outlet 1 2067168 Hose - Hyd Strg Oil Cooler w/o T50 1 (Tilt Hood) 2067169 Hose - Hyd Strg Oil Cooler w/T50 1 (Tilt Hood) 443632 Clamp - Hyd Strg Oil Cooler Hose 2 15506557 TY Wrap Hyd Strg Oil Cooler Hose 1 15556653 Hose - Hyd Strg Cyl - LH Turn 1 15556654 Hose - Hyd Strg Cyl - RH Turn 1 7806584 Valve Asm. - P/S Pump Relief 1 Pressure Control 7825450 Fitting Asm - P/S Pump Outlet 1 5688035 Seal P/S Outlet Fitting "O" Ring 1 2025565 Nut Air Brake Tube 2 2256475 Sleeve - Air Brake Tube 2 580074 Retainer - Steering Upper Shaft 1

15559733 Service Kits for 9,000 lb. Capacity 1 AND Coleman Front Axle SEO IFVZ Equipped 15556769 with Hydraulic Brakes RPO JE3

Service Kit 15559733 consists of the following listed items:

15559734 Instructions 1 7840554 Pump - Hydraulic 1 15504123 Bracket - Hyd Pump Frt 1 2048686 Support - Hyd Pump Brkt 1 2050307 Support - Hyd Pump Brkt 1 2090424 Plate - Hyd Pump Adj 1 15504122 Bracket - Hyd Pump Rear 1 180120 Bolt/Screw - Hyd Pump Brkt 2 11509557 Bolt/Screw - Hyd Pump Brkt 2 666674 Washer - Hyd Pump Brkt 4 2040951 Washer - Hyd Pump Brkt 4 11504596 Bolt/Screw - Hyd Pump Brkt to 1 Engine Block

QUANTITY PART NO. DESCRIPTION PER VEHICLE --------- ------------------------------------ ------------ Service Kit 15559733 (Cont'd)

11500932 Bolt/Screw - Hyd Pump Brkt to 6 Engine Block 2039107 Washer - Hyd Pump Brkt to Engine 7 Block 9422297 Nut - Hyd Pump Brkt 2 11501034 Nut - Hyd Pump Brkt 2 11500920 Bolt/Screw - Hyd Pump Adj 1 11500306 Washer - Hyd Pump Adj Bolt 1 11500760 Nut - Hyd Pump 1 8869109 Pulley - Hyd Pump 1 2436165 Washer - Hyd Pump Adj Pulley 1 9418222 Nut - Hyd Pump Pulley 1 15509704 Bracket - Hyd Pump Belt Guide 1 2050481 Guide - Hyd Pump Belt 1 9424320 Bolt/Screw - Hyd Pump Belt Guide Brkt 2 9439512 Washer - Hyd Pump Guide Brkt 2 11502414 Belt - Hyd Pump 1 15502618 Tube and Hose - Power Head Inlet 1 2061138 Tube - Pwr Head Outlet Upr 1 707636 Hose - Pwr Head Outlet Tube 1 2035067 Hose - Hyd Pump Inlet 1 274307 Clamp - Hyd Pump Inlet Hose 4 11500916 Bolt/Screw - Pwr Head Tube Clip 1 2041068 Clip - Pwr Head Outlet Tube 2 2041582 Clip - Pwr Head Inlet Tube/Pump 3 Outlet Tube 11508687 Bolt/Screw - Pwr Head Tube Clip 7 11500323 Washer - Pwr Head Tube Clip 2 11500749 Nut - Pwr Head Tube Clip 1 15504248 Reservoir - Hyd Strg Pump 1 2066570 Tube - Hyd Strg Oil Cooler 1 2078179 Tube - Hyd Strg Oil Cooler 1 2067171 Hose - Hyd Strg Oil Cooler to Reservoir 1 2069729 Hose - Hyd Strg Oil Cooler to Reservoir 2078192 Bracket - Hyd Strg Oil Cooler Tube 1 2078193 Bracket - Hyd Strg Oil Cooler Tube 1 22527475 Bolt - Hyd Strg Oil Cooler Tube 2 722013 Clip - Hyd Strg Oil Cooler Tube 1 2041583 Clip - Hyd Strg Oil Cooler Tube 3 11508154 Bolt - Hyd Strg Oil Cooler Tube Clip 1 11500045 Washer - Hyd Strg Oil Cooler Tube Clip 3 22521550 Nut - Hyd Strg Oil Cooler 3 14052374 Clamp Hyd Strg Oil Cooler Hose 4 11500918 Bolt Hyd Strg Oil Cooler Hose Clamp 1 455002 Bolt Hyd Strg Assist Cyl to Frame 1 2044321 Clip Hyd Strg Pump Outlet Tube 1 2067136 Hose Hyd Strg Reservoir 1

2077282 Hose - Hyd Strg Reservoir 1 22518666 Clamp - Hyd Strg Reservoir Hose 2 15569645 Loom - Hyd Strg Reservoir Hose 1 2031176 Spring - Hyd Strg Reservoir Hose 1 2066999 Spring - Hyd Strg Reservoir Hose 2 11509088 Ty Wrap - Hyd Strg Pump Hose 1 11502340 Belt - Hyd Strg Pump 1

CLAIM INFORMATION

Submit a Product Campaign Claim with the information indicated below: * ** | | FAILED |PARTS| |LABOR|LABOR|OTHER| NET REPAIR PERFORMED |PC|PART NO.|ALLOW|FC|OP | HRS | HRS | AMOUNT -----------------------------|--|--------|-----|--|-----|-----|-----|------- MODIFY 12,000 LB. AXLE | | | | | | | | (SEO IFVQ) W/AIR BRAKES | | | | | | | | (RPO JE4) |1 |15556711| ** |00|V3400| 1.6| .1 | 9.79 -----------------------------|--|--------|-----|--|-----|-----|-----|------- MODIFY 9,000 LB. AXLE (SEO | | | | | | | | 1FVZ) W/AIR BRAKES (RPO | | | | | | | | JE4) |1 |15556769| ** |00|V3401| 5.9| .1 | 9.79 -----------------------------|--|--------|-----|--|-----|-----|-----|------- MODIFY 9,000 LB. AXLE (SEO | |15559733| | | | | | 1FVZ) W/HYDRAULIC BRAKES | | | | | | | | (RPO JE3) |2 |15556769| ** |00|V3402| 8.3| .1 |13.36 -----------------------------|--|--------|-----|--|-----|-----|-----|------- MODIFY 9,000 LB. AXLE (SEO | | | | | | | | IFVZ) W/HYDRAULIC BRAKES (RPO| | | | | | | | JE3) AND FIBERGLASS TILT HOOD| |15559733| | | | | | (RPO T50) |2 |15556769| ** |00|V3403| 7.4| .1 |13.36

*Campaign Administrative Allowance.

**The Parts Allowance 5hould be the sum total of the current GMWDD Dealer Net price plus 30% of all parts required for the repair.

***The amount in the "Net Amount" column covers the cost of power steering fluid and grease lube required in conjunction with this campaign.

Dealers will automatically receive the correct labor and material allowance based on labor operation performed.

Refer to the Chevrolet Claims Processing Manual for details on Product Campaign Claim submission.

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.