Tools Required

J 36850 Transjel® Lubricant Assembly Lube

1. Lubricate all components as assembly progresses, using J 36850 .



2. Install the input shaft in the adapter plate.



3. Assemble the shift shaft to the mainshaft.
4. Install the neutral return roll pin to the shift shaft.
5. Install the mainshaft and the shift shaft assembly into the adapter plate.



6. Install the countershaft assembly using the following sequence:

6.1.	Lift up the mainshaft assembly enough in order to install the countershaft assembly.

6.2.	Install the countershaft assembly.

6.3.	Lift the mainshaft assembly enough in order to rotate the input shaft to engage the synchronizer keys with 4th gear blocking ring.




7. Install the 5th/6th and the reverse shift shaft.

Align the slots of the shift shaft levers with the interlock plate.

Tools Required

J 36850 Transjel® Lubricant

Important: Lubricate all components as the assembly progresses. Use J 36850 or the equivalent.

1. Apply sealant GM P/N 12345739, (Canadian P/N 10953472) or equivalent to the transmission case to adapter plate mating surface.



2. Do the following in order to install the transmission case and the offset lever:

2.1.	Shift the transmission into NEUTRAL in order to keep the 3rd/4th shift shaft from engaging.

2.2.	Install the offset lever.

2.3.	Slide the transmission case onto the gear clusters and the shift rail components.




3. Apply threadlock GM P/N 12346004, (Canadian P/N 10953480) or equivalent to the threads of the shift lever guide bolts.




Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

4. Install the shift lever guide bolts and pull up on 5th/6th and reverse shift rail assembly. This will help align the slot of the shift interlock plate with the guide bolt hole.

Tighten
Tighten the bolts to 27 N·m (20 Ib ft).




5. Install the adapter plate to transmission case bolts.

Tighten
Tighten the bolts to 48 N·m (36 Ib ft).




6. Install the magnets into the transmission case.



7. Install the shift detent roller, spring and plug.



8. Install the shift detent assembly.

Tighten
Tighten the detent assembly to 40 N·m (30 Ib ft).




9. Install the computer aided gear select solenoid.

Tighten
Tighten the solenoid to 40 N·m (30 Ib ft).

1. Position the transmission in the horizontal position.
2. Install the countershaft extension assembly and the 5th/6th shift fork. The splines of the countershaft extension must engage the splines of the countershaft.



3. Install the reverse shift collar and reverse shift collar pin.

Tools Required

Install the 5th/6th speed driven gear using the J 39441 and J 39441-10 . The smaller outside diameter (OD) of the gear faces down.

1. Install the reverse shift fork, the synchronizer and the thrust washer.



2. Install a new shift fork retainer ring.



3. Install the reverse synchronizer retainer ring.

1. Install the following parts in order:

1.1.	The blocking ring

1.2.	The wave washer

1.3.	The wave washer so the concave side faces the blocking ring

1.4.	The caged needle bearing

1.5.	The reverse speed gear

1.6.	The thrust washer

1.7.	The retainer ring




2. Install the following parts in order:

2.1.	The spacer

2.2.	The roller bearing

2.3.	The spacer

2.4.	The roller bearing retainer ring




3. Install the following parts in order:

•	The snap ring

•	The speed sensor rotor

•	The snap ring




4. Install the shift shaft extension.
5. Install the shift guide.
6. Install NEW shift guide roll pins.



7. Lift up on the shift shaft extension while installing the shift detent roller, spring and plug.

Tools Required

J 39430 Transmission Holding Fixture

1. Install the following parts in order:

1.1.	The funnel

1.2.	The selective shims--Refer to the Countershaft Extension in Shimming Procedures .

1.3.	The countershaft extension bearing race




2. Install the following parts in order:

2.1.	The reverse idler shaft

2.2.	The roller bearing

2.3.	The reverse idler gear




3. Apply GM P/N 12345382, (Canadian P/N 10953489) or the equivalent to the reverse idler shaft brackets bolt threads.




Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

4. Install the following parts in order:

4.1.	The reverse idler shaft bracket.

4.2.	The reverse idler shaft bracket bolts.

Tighten
Tighten the bolts to 25 N·m (18 Ib ft).




5. Apply sealant GM P/N 12345739, (Canadian P/N 10953472) or equivalent to the extension housing to the transmission case mating surface.



6. Apply thread sealer GM P/N 12346004, (Canadian P/N 10953480) or equivalent to the top 2 extension housing bolts.




Important: Align the 5th/6th shift shaft to the extension housing bore in order to install the extension housing.

7. Install the extension housing.
8. Install the extension housing bolts.

Tighten
Tighten the bolts to 48 N·m (36 lb ft).




9. Install the propshaft connector.
10. Install the propshaft connector nut.

Tighten
For the CTS only, tighten the nut to 136 N·m (100 lb ft).




11. Install the shifter cover plate.
12. Install the shifter cover plate bolts.

Tighten
Tighten the bolts to 20 N·m (15 lb ft).

13. Install the vent tube.



14. Remove the J 39430  (2).



15. Install the remaining 2 adapter plate bolts (1) and (2).

Tighten
Tighten the adapter plate bolts to 48 N·m (36 lb ft).