You can fit up to 29 by 12's but that requires a lift and wheel spacers. I am not sure if 26's will require wheel spacers if you go 12 inches wide. I put 25 by 13's on a diesel 2510 will a lift from moose that lifts the front end 1.5. I am currently putting 26 by 12s on a 3010 gas with a lift and wheel spacers from highlifter. If you really are interested in what you can do you can go to www.highlifter.com
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