GM Service Manual Online
For 1990-2009 cars only

Slipping 2-3 Upshift

Checks

Cause

Oil Pressure

Low

Brake Band

Loose Adjustment

Valve Body Checkball

Dropped out

3rd Clutch Piston Seals

Leak

3rd Clutch Piston Checkball

Dropped out

3rd Clutch Piston

Cracked or broken

Input Shaft Bushing

Worn