Harsh Fourth, Fifth, and Sixth Shift

WARNING: This page is about a different car, the 2017 GMC Acadia. 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 or damaged 4-5-6 Clutch Piston (520) and Piston Seals (518, 519, 521) Inspect for plugged or restricted 4-5-6 Piston Dam air bleed Inspect for leaking or damaged 4-5-6 Clutch Dam (523) Inspect for plugged or restricted Dam oil feed hole in the 4-5-6 Piston (520) Inspect for fatigued 4-5-6 Clutch Piston Spring (522) Inspect for leaking 4-5-6 Clutch Dam Seals (523) Inspect for improper surface finish on 4-5-6 Clutch Plates (525-528) Inspect for fatigued 4-5-6 Clutch Waved Plate (525) Inspect for porous, improper surface finish, seal groove damage or plugged or restricted oil passages of the 3-5 Rev/4-5-6 Housing (516)

Checks

Causes

4-5-6 Clutch Assembly

Inspect for leaking or damaged 4-5-6 Clutch Piston (520) and Piston Seals (518, 519, 521)
Inspect for plugged or restricted 4-5-6 Piston Dam air bleed
Inspect for leaking or damaged 4-5-6 Clutch Dam (523)
Inspect for plugged or restricted Dam oil feed hole in the 4-5-6 Piston (520)
Inspect for fatigued 4-5-6 Clutch Piston Spring (522)
Inspect for leaking 4-5-6 Clutch Dam Seals (523)
Inspect for improper surface finish on 4-5-6 Clutch Plates (525-528)
Inspect for fatigued 4-5-6 Clutch Waved Plate (525)
Inspect for porous, improper surface finish, seal groove damage or plugged or restricted oil passages of the 3-5 Rev/4-5-6 Housing (516)