4T65-E Launch Shudder on Acceleration, Lack of Power After 1-2 Upshift (Inspect and Replace 4th Clutch Piston and Friction Plates)
| Subject: | 4T65-E Launch Shudder on Acceleration, Lack of Power After 1-2 Upshift (Inspect and Replace 4th Clutch Piston and Friction Plates) |
| Models: | 2006 Buick Allure (Canada Only), LaCrosse, Lucerne, Rendezvous, Terraza |
| 2006 Chevrolet Impala, Malibu SS, Malibu Maxx SS, Monte Carlo, Uplander |
| 2006 Pontiac Grand Prix, Montana SV6, G6 GTP |
| 2006 Saturn Relay |
| with 4T65-E Automatic Transmission (RPOs MN7, M15, M76) |
Condition
Some customers may comment on a low speed shudder upon acceleration, usually in the 0-32 km/h (0-20 mph) range. The customer may also comment on lack of power after a 1-2 gear upshift.
Cause
The cause of this condition may be due to a binding 4th clutch piston.
Correction
Do This | Don't Do This |
|---|---|
Inspect and replace the 4th clutch piston and friction plates. | DO NOT replace the complete transmission assembly. |
Inspect the 4th clutch piston, the seals and fiber plates. The plates may show signs of excessive heat in the center of the plate. The fiber plates may also show signs of heat in the adjacent area. Normal plates are heat treated and have a slightly dark appearance.
Replace the 4th clutch piston, seals and fiber plates as necessary. Refer to the Transmission/Transaxle section of SI.
Parts Information
Part Number | Description |
|---|---|
24208560 | Piston, 4th Clutch (item 603) |
24218248 | Plate Asm (Fiber), 4th Clutch (item 501) |
8644917 | Seal Kit, 4th Clutch (includes outer (item 604) and inner (item 605) seal) |
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation | Description | Labor Time |
|---|---|---|
K7528 | Clutch Assembly, Fourth - R&R or Replace | Use Published Labor Operation Time |
