GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

1

Inspect the first gear thrust bearing.

Is the bearing missing or showing too much end play?

Go to Step 2

Go to Step 3

2

Repair or replace the bearing as needed.

Does the transaxle still slip out of gear?

Go to Step 3

System OK

3

Inspect the first gear washer.

Is the washer missing or show too much end play?

Go to Step 4

Go to Step 5

4

Repair or replace the washer.

Does the transaxle still slip out of gear?

Go to Step 5

System OK

5

Inspect the first gear spline lock on the 1st/2nd synchronizer sleeve or the hub.

Is the spline lock worn or damaged?

Go to Step 6

Go to Step 7

6

Repair or replace the lock.

Does the transaxle still slip out of gear?

Go to Step 7

System OK

7

Inspect the 2nd gear spline lock on the 1st/2nd synchronizer sleeve or the hub.

Is the lock worn or damaged?

Go to Step 8

Go to Step 9

8

Repair or replace the lock.

Does the transaxle still slip out of gear?

Go to Step 9

System OK

9

Inspect the 3rd gear spline lock on the 3rd/4th synchronizer sleeve or hub.

Is the lock worn or damaged?

Go to Step 10

Go to Step 11

10

Repair or replace the lock.

Does the transaxle still slip out of gear?

Go to Step 11

System OK

11

Inspect the 4th gear spline lock on the 3rd/4th synchronizer sleeve or hub.

Is the lock worn or damaged?

Go to Step 12

Go to Step 13

12

Repair or replace the 4th gear spline lock.

Does the transaxle still slip out of gear?

Go to Step 13

System OK

13

Inspect the 5th gear spline lock on the 5th synchronizer sleeve.

Is the spline lock damaged or worn?

Go to Step 14

Go to Step 15

14

Repair or replace the 5th gear spline lock.

Does the transaxle still slip out of gear?

Go to Step 15

System OK

15

Inspect the reverse gear spline lock.

Is the lock damaged or worn?

Go to Step 16

Go to Step 17

16

Repair or replace the lock.

Does the transaxle still slip out of gear?

Go to Step 17

System OK

17

Disassemble the transaxle and repair as necessary. Refer to Transmission Case Disassemble in the M86/M94 Section of the Transmission Unit Repair Manual.

Does the transaxle still slip out of gear?

Go to Transmission Replacement

System OK