GM Service Manual Online
For 1990-2009 cars only

No Reverse or Slips in Reverse

Checks

Causes

Input Housing Assembly

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

Manual Valve Link

Disconnected

Valve Body Assembly

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

Reverse Input Clutch Assembly

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

Lo and Reverse Clutch

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

Reaction Sun Shell

Broken spline on reaction sun shell/replace shell