2000 TO 2004 CHEV-GMD 1500 SERIES HAVE DISC BRAKES WITH 6 LUG WHEELS.THE WHEELS OFF A DRUM BRAKE WILL HIT THE CALIPERS CHECH AXLE LENGTH TO BE SURE IT IS NOT TO WIDE. BY THE WAY GM REPLACED THE DISC WITH DRUMS IN 2005,WITH LARGER ROTORS ON THE FRONT. WHY ????? NOT NEEDED ?