No Overrun Braking - Manual 3-2-1

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

Checks	Causes
External Linkage	Not adjusted properly
Valve Body Assembly (60)	4-3 Sequence valve stuck Checkball mispositioned Spacer plate and gaskets incorrect, damaged or mispositioned
Overrun and Forward Clutch Assembly (644-651)	Turbine shaft oil passages plugged or not drilled Turbine shaft seal rings damaged Turbine shaft sealing balls loose or missing Porosity in forward or overrun clutch piston Overrun piston seals cut or damaged Overrun piston checkball not sealing