GM Service Manual Online
For 1990-2009 cars only

Harsh Shifts

Checks

Causes

Line Pressure

High

Refer to High or Low Line Pressure .

Checkballs (26)

Missing; no orificed apply

Accumulators

    â€¢ Springs or piston binding; no accumulation
    â€¢ Accumulator valve is stuck

Clutch Housing Retainer and Ball Assemblies

Plugged