I just changed one of these on my truck and found the seal at NAPA. NAPA part #: 22340. Only was about $9.00. The seal I could not locate was the paper gasket for the bearing retainer on the back of the tranny. RTV gasket goop worked good though.


"The Operation of GMC trucks is normally smooth and steady, with no loud rattling, knocking or unusual noises. A good driver will quickly become accustomed to driving a GMC truck and will get the feel of his vehicle regardless of his engineering knowledge."-TM10-1563