The biggest you can go is a LT 285/75/16 but you will get alittle rub on your lower control arm when you turn your wheel all the way to full lock, but nothing to worry about I ran that size on my 1996 1500 4x4 for a while until I had it lifted.
Yeah I had that problem too, actually it would just be better to get a 16x8 cause the factory rims offset isnt that great and a 285 should be mounted on at least a 8"wide rim. When mine were on the factory 16x7's it put alot of stress on the tire and rim.
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