Harsh, Soft, Delayed or Slipping 1-2-3-4 Shift

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Checks	Causes
1-2-3-4 and 3-5-R Clutch Assembly (51)	Inspect for damaged or worn 1-2-3-4 clutch plates (408-410). Inspect for damaged 1-2-3-4 clutch piston (414), piston housing (417), spring (413), and dam assembly (412). Inspect for damaged 1-2-3-4 clutch piston dam retaining ring (411). Inspect for cut, worn, or damaged 1-2-3-4 clutch piston seal (416), inner seal (423), and housing seals (424 and 425). Inspect for improper selective 1-2-3-4 clutch backing plate retaining ring (429). Inspect for damaged 1-2-3-4 clutch backing plate (407). Inspect for worn splines on the backing plate.

Checks

Causes

1-2-3-4 and 3-5-R Clutch Assembly (51)

Inspect for damaged or worn 1-2-3-4 clutch plates (408-410).
Inspect for damaged 1-2-3-4 clutch piston (414), piston housing (417), spring (413), and dam assembly (412).
Inspect for damaged 1-2-3-4 clutch piston dam retaining ring (411).
Inspect for cut, worn, or damaged 1-2-3-4 clutch piston seal (416), inner seal (423), and housing seals (424 and 425).
Inspect for improper selective 1-2-3-4 clutch backing plate retaining ring (429).
Inspect for damaged 1-2-3-4 clutch backing plate (407). Inspect for worn splines on the backing plate.