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

WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.

Checks	Causes
Hybrid Low 1-2 and Hybrid Direct 2-3-4 Clutch Assembly	Inspect for damaged or worn 1-2 and 2-3-4 clutch plates. Inspect for damaged 1-2 and 2-3-4 clutch piston, piston housing, spring, and dam assembly. Inspect for damaged 1-2 and 2-3-4 clutch piston dam retaining ring. Inspect for cut, worn, or damaged 1-2 and 2-3-4 clutch piston seal, inner seal, and housing seals. Inspect for improper selective 1-2 and 2-3-4 clutch backing plate retaining ring. Inspect for damaged 1-2 and 2-3-4 clutch backing plate. Inspect for worn splines on the backing plate.

Checks

Causes

Hybrid Low 1-2 and Hybrid Direct 2-3-4 Clutch Assembly

Inspect for damaged or worn 1-2 and 2-3-4 clutch plates.
Inspect for damaged 1-2 and 2-3-4 clutch piston, piston housing, spring, and dam assembly.
Inspect for damaged 1-2 and 2-3-4 clutch piston dam retaining ring.
Inspect for cut, worn, or damaged 1-2 and 2-3-4 clutch piston seal, inner seal, and housing seals.
Inspect for improper selective 1-2 and 2-3-4 clutch backing plate retaining ring.
Inspect for damaged 1-2 and 2-3-4 clutch backing plate. Inspect for worn splines on the backing plate.