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When I bought my '96 Sierra 1500 Z71 approx. 3yrs ago I replaced the front rotors and had the same problem. I think that I ended up breaking 3 snap-on impact sockets in the process. I sprayed everything down with a rust penetrating lubricant and let it sit and soak in for a while then resprayed it again. I think I used a HUGE impact on it and then resorted to a 3/4" rachet/socket with a monster break over bar on it. It took a while and a lot of strength, but eventually cracked. I suggest getting a good rust penetrating spray, like a BG product or something similar, and soaking all the nuts and bolts in that multiple times. Good Luck!!!

AnswerI am currently trying to change the same rotors for a 1997 Sierra. Having a 3/4 ton pickup with 4wd. Engine 5.7 with Allison trannie. The attempt I have made starts with removal of the caliper. then there are 3 bolts that mont the caliper frame to the hub. this hub also seems to extend through rotors and has a 5/16" plate that mounts to rotor . So far 3 sokets have broken and I do not try heating it. As is I had to heat the lug nuts off and wack the rim with a sledge as the metal rim bonded with rear drums and front rotor. I hope to complete this in a week , it is my plow truck and need it in better shape.
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Q: How do you change front rotors on 1998 GM Sierra?
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