Harsh Fourth, Fifth, and Sixth Shift

WARNING: This page is about a different car, the 2016 GMC Acadia, 2016 Chevrolet Traverse, and 2016 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.

Checks	Causes
4-5-6 Clutch Assembly	Inspect for leaking 4-5-6 clutch piston (433) and piston seals (430-432). Inspect for plugged or restricted 4-5-6 piston dam air bleed. Inspect for fatigued 4-5-6 clutch piston spring (434). Inspect for leaking 4-5-6 clutch dam seals (435). Inspect for improper surface finish on 4-5-6 clutch plates (439-441). Inspect for porous, improper surface finish, seal groove damage or plugged or restricted oil passages of the 3-5-rev/4-5-6 housing (422). Inspect for leaking or damaged 4-5-6 piston dam (435).

Checks

Causes

4-5-6 Clutch Assembly

Inspect for leaking 4-5-6 clutch piston (433) and piston seals (430-432).
Inspect for plugged or restricted 4-5-6 piston dam air bleed.
Inspect for fatigued 4-5-6 clutch piston spring (434).
Inspect for leaking 4-5-6 clutch dam seals (435).
Inspect for improper surface finish on 4-5-6 clutch plates (439-441).
Inspect for porous, improper surface finish, seal groove damage or plugged or restricted oil passages of the 3-5-rev/4-5-6 housing (422).
Inspect for leaking or damaged 4-5-6 piston dam (435).