Hey again yall! I am in the market for new rims and hope to go buy some black Rockcrawlers tommaro. What would the best backspaceing be with a 33", 12.50 A/T( Accepting all donationtions to help pay for M/T's :D )?? Thanks again guys!!

I believe anything 3.75in or less will work. If you get a fairly wide wheel(10in), you would probably need signifcantly less backspacing than 3.75in, or you could always use a small spacer.

12.50 33 work better on 8 inch wheeling IMO 10's work too just lose some ground clearance. jiMMy

10" wheels typically come in 4" B/S and 8" wheels in 3.75" and with a stock front end setup 3.75" is ideal. With a 4" B/S your balancing weights may the hit the steering knuckes, mine was a tight fit so either use 1/4" spacers or you can just grind the knuckle down a bit (cheap and easy).
Question: If you're installing a 4" lift why not go with 35" M/T? There is plenty of clearance and you can always pull out the sawzall for the rear fenders but it's not needed.