MP 1222 LD with 27T Input Spline
WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The high/low clutch (9) has bias pointing engagement teeth. The leading edges of the teeth are not symmetric.