I would rethink that 4x2 8" lift on 37's. I did a 6" Skyjacker and put a 2" coil spacer ontop on my Fx4. I am running 37x13.50 Mud Grapplers and have rubbing issues. I have done as much wheel well trimming as possible and still rub the inside wheel in a turn on an incline or bump. This is not always the case, but it does happen every so often. The other day I hit a big a$$ bump (mistaked an ice mound for a snow drift) while making a left turn... The wheel jammed up in the well and broke a bunch of plastic and bent some metal... 2500 miles and I already screwed it up! I never intended on taking my truck offroad, but I know now that it would suck! So with the 4x2's sitting lower, I would be worried about running a 37x13.50.

 

my specs are -18 offset and i have 4.75 inches of backspacing. I am not completely sure what offset is but i think its something with the way the rim lines up from the center?? I don't know lol.. and 5 inches of backspacing should work but you might want to look into something like mine just to be safe. also why don't you look into some 36 inch iroks??

 

yeah the more i am thinking and reading everyones responses i am starting to really consider down grading.36s i am going to investigate and i think for cost and the facts tires are limited i am going down to a 20 inch wheel.i really wanted a 22 but i think it would be smarter to do the 20 instead.thanks for posting your specs btw.

 

Since this picture was taken I have added a 1.5" block to the rear under the 2.5" block that came with the kit. I got the block from Autospring. Normally I wouldn't stack blocks but the total hight of the two blocks is about 4" and thats not much. They are also a double pin design so I'm not worried about them rotating.

 

 

i bet you could get 37s with a 6in lift, 3in leveling kit, just make sure the tires are 12.5 and right off set, and if that dosnt work trow a body lift on and go 40s