Brad
Can I convert my 2009 GMC rear brakes over from drums to rotors 
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cosmicfrog
Your truck is new enough that there is probably a kit out there to do it. The disc install isn't bad but the parking brake change over can be a bit of a chore. You will probably need to change your master cylinder too. Cost will be your limiting factor.
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94Dak
What year & model GMC? Some came from the factory with rear disk brakes, Chevy Silverado, GMC Denali & Cadillac Escalade, so all you may really need to do is find one in a salvage yard and strip out what you need and have a bolt in factory disk brake rear. If you do find one in a salvage yard get the rear, including all the parking brake cables, lines and proportioning valves/blocks and master cylinder. You may get lucky and find one with a rear sway bar too if yours doesn't already have one.
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