GM Service Manual Online
For 1990-2009 cars only

No Engine Braking - D2 for GMC Truck Yukon XL - 2WD 2003

Checks

Cause

Bushing (234)

Worn or damaged

Thrust Washer (218)

Worn or damaged

Rear Gear set

Spalled or broken

Reaction Drum and Carrier (651)

Broken

Mainshaft (662)

The shaft or the splines are broken.

Output Shaft (671)

The shaft or the splines are broken.

Sun Gear Shaft (649)

The shaft or the splines are broken.