The GM full-size trucks had 5 lugs for 2wd, and 6 for 4wd for the 1500 models. The 2500 and up all had 8 lug wheels. When they went to the GMT800s in 1999, they became 6 lug or 8 lug. The Chevy Colorado and GMC Canyon use 6 lugs on most models, and the work ...