GM Service Manual Online
For 1990-2009 cars only

No Reverse or Slips in Reverse

Checks

Causes

Input Housing Assembly

    â€¢ 3-4 Apply ring stuck in applied position
    â€¢ Forward clutch not releasing
    â€¢ Turbine shaft seals missing, cut or damaged

Manual Valve Link

Disconnected

Valve Body Assembly

    â€¢ 2-3 Shift valve stuck
    â€¢ Manual linkage not adjusted
    â€¢ Spacer plate and gaskets incorrect, mispositioned or damaged
    â€¢ Lo overrun valve stuck
    â€¢ Orificed cup plug restricted, missing or damaged

Reverse Input Clutch Assembly

    â€¢ Clutch plate worn
    â€¢ Reverse input housing and drum assembly cracked at weld
    â€¢ Clutch plate retaining ring out of groove
    â€¢ Return spring assembly retaining ring out of groove
    â€¢ Seals cut or damaged
    â€¢ Restricted apply passage
    â€¢ Porosity in piston
    â€¢ Belleville plate installed incorrectly
    â€¢ Excessive clutch plate travel
    â€¢ Oversized housing

Lo and Reverse Clutch

    â€¢ Clutch plates worn
    â€¢ Porosity in piston
    â€¢ Seals damaged
    â€¢ Return spring assembly retaining ring mispositioned
    â€¢ Restricted apply passage