Gmt900 2500hd. 18x9 Wheels With +18mm Offset. 285/60-18 Tires.

[CasualButJiggy]

Any fitment issues here are solved with a few twists of the torsion bars as I understand it. Please correct me if I'm wrong, and thank you for the help.

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Yeah, you probably won't have any problems. My tires are the exact same size as that and on a -12 offset rim and I don't have any issues at stock ride height or lower. Since your truck is HD you can lift the front easily if you do somehow run into a clearance problem at the front.