GM Service Manual Online
For 1990-2009 cars only

Checks

Causes

4th Band

Slipping, burned

4th Band Servo Pin

Stuck, broken

4th Servo Piston

Damaged, cracked

4th Servo Seals

Cut, rolled or damaged

Coast Clutch Plates

Burned, damaged

Coast Clutch Seal/Checkball

Cut, worn or nicked

Coast Clutch Support Seals

Damaged, missing