the white cummins has no leveling kit....if you do a leveling kit with only a 33 it should still fit in a garage with a 7' door....mine did when i had a leveling kit on there.....i wouls stay around a -10 or -15 to a +10 offset.....do you like your wheels to stick out a lot or not?
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05 Cummins 4x4 auto
01 cummins 2wd 6speed
06 Duramax LBZ- sold