33s would be fine but in my opinion I dont think they would look right ..tho gas mpg would be fine lol but 35 look great and I was Ok with the look and power of things gas sucked lol but I had 392 gears and now I'm on 38.5 and regearing
I averaged around 15-16 MPG 100% Stock, With a CAP,(MPG Went up 1mpg with a cap) With stock size 265/70/16s. But power SUCKED, It didnt like gaining speed it would zip up and shift so quickly I would be threw my power band before getting up to speed. Even with OD Off. I was Thinking I would loose a ton of power by stepping up to 33's.
But with 33's my 3.92 , My truck is STILL getting 15-16mpg every fill up. And NO CAP, And I have more power pulling into traffic and cruising along and coming up to hill. To me the truck goes 100% Better then it did.
I think 33's are perfect for the 3.92 gearing, Could probably get away with a 35. But if your going to do any hard wheeling a 35" tire on our IFS, It Isnt the best idea. If its just a DD Sure.