GM Service Manual Online
For 1990-2009 cars only

Checks

Causes

4-5-6 Clutch Assembly

    â€¢ Inspect for leaking or damaged 4-5-6 Clutch Piston (520) and Piston Seals (518, 519, 521)
    â€¢ Inspect for plugged or restricted 4-5-6 Piston Dam air bleed
    â€¢ Inspect for leaking or damaged 4-5-6 Clutch Dam (523)
    â€¢ Inspect for plugged or restricted Dam oil feed hole in the 4-5-6 Piston (520)
    â€¢ Inspect for fatiqued 4-5-6 Clutch Piston Spring (522)
    â€¢ Inspect for leaking 4-5-6 Clutch Dam Seals (523)
    â€¢ Inspect for improper surface finish on 4-5-6 Clutch Plates (525-528)
    â€¢ Inspect for fatigued 4-5-6 Clutch Waved Plate (525)
    â€¢ 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)