Without changing the stock rims what would be the largest tire I could put on my 1500 4x4?

 

There are a number of "stock rims" available on the 1500 depending on the trim level they could be 17" or 20". A tire size will include the rim size that it will fit. I suspect that you may be only looking for the maximum outside diameter that won't cause interference.

 

i'm pretty sure if you go with like a 10.5 inch width you could fit some 33 inch all terrains. not positive though.

 

they should fit just fine....

of note: procomp advertises its 12.5 tires fitting on an 8'inch rim.... everyone else says 8.5: http://www.procomptires.com/mtapps.htm#