The rims have a 4" backspacing and I am running 225/40/18. No new crossmember as of yet, but i need one since it is almost worn down. The only thing I suggest is if you do this drop, is to get the notch kit. My rearend hits the frame on large bumps and sharp turns. Thats why i can't wait for the monster notch and bags. Next Month hurry hurry hurry! her is another pic Kinda bad though