A/T - 4T65-E Launch Shudder/Low Power After 1-2 Shift

Bulletin No.: 06-07-30-018

Date: August 17, 2006

TECHNICAL

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





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

Warranty Information





For vehicles repaired under warranty, use the table.





Disclaimer