Harsh, Soft, Delayed or Slipping Third, Fifth, or Reverse Gear

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Cadillac Escalade EXT. 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 3-5-R clutch plates (402-404). Inspect for damaged 3-5-R clutch piston (421), apply ring (405), and spring (420). Inspect for cut, worn, or damaged 3-5-R clutch piston dam O-ring seal (418), inner seal (419), and outer seal (422). Inspect for improper selective 3-5-R clutch backing plate retaining ring (400). Inspect for damaged 3-5-R clutch backing plate (401). Inspect for worn splines on the backing plate.
Control Valve Upper Body Assembly	Inspect for a worn, sticking or damaged 3-5 reverse clutch regulator valve and spring. Inspect the valve bore for debris or scoring.

Checks

Causes

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

Inspect for damaged or worn 3-5-R clutch plates (402-404).
Inspect for damaged 3-5-R clutch piston (421), apply ring (405), and spring (420).
Inspect for cut, worn, or damaged 3-5-R clutch piston dam O-ring seal (418), inner seal (419), and outer seal (422).
Inspect for improper selective 3-5-R clutch backing plate retaining ring (400).
Inspect for damaged 3-5-R clutch backing plate (401). Inspect for worn splines on the backing plate.

Control Valve Upper Body Assembly

Inspect for a worn, sticking or damaged 3-5 reverse clutch regulator valve and spring. Inspect the valve bore for debris or scoring.