i have a 2wd and have a 3"bl and 3.5" spindles and a 2" block on the rear end.
So whats the biggest tire and widest width rims i could run with out much rubbin or problems.
And if i get a good deal on some that are a little bit too big. im gunna get me some 2" coil spring spacers and a 2" rear lift leaf shackle.
thanks guys. I dont klnow much about the backspacing and all that kinda stuff ether...

 

Go with a wheel no more than 9" wide and with about 4.5" of backspacing. As for tire's nothing bigger than a 35x12.50. Even with an extra 2" under there from a coil spring spacer chance's are you'll do some big rubbing with 37's. It take's about 10" of lift at least to properly run 37's on our body style 2wd.

 

I ran a 3" BL, 3.5" spindles, and a 1.5" coil spacer at one time with 35's. I was running a 10" wide wheel and had to do some major trimming inside the fender wells. With an 8" wide wheel you should be pretty good though.

 

Don't forget the re-gear

 

Will LT315/70/17 tires fit on stock 17 inch rims on a 2000 f150 lariat. I have 285's on there now with plenty of clearance.

 

Give us some more info on your truck. 2wd or 4wd? Stock or lifted?

 

I've seen a guy run just a 3.5'' spindle lift and clear 315's so you should be good, if you go with just a stock or x8 width rim