Super Duty & Heavy Duty1999 to current Ford F250, F350, F450 and F550 Super Duty with diesel V8 and gas V8 and V10 engines
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I have a 04 F250 with 315's with a leveling kit.
All I had to do was cut 1" off of the lower air valance on each side you cant even tell I cut it. Took about 2 minues with a saw zaw.
I am guessing your rims have a 4.5 in backspacing right???
That is a must, or you tires will hit the leaf springs.
Keep in mind that different brands/model tires of the same rated size are not actually the same size. Some are bigger than rated, some are smaller.
My BFG TA K/O's in 315/75-16 did not require any trimming with only 2" lift as they are slightly under a true 35".
'99 F250 V10 Super Cab Long Bed 4x4. '06 short block, PI conversion, modded airbox, 5 Star custom tune, FM50BB, 315/75-16 GY Duratracs, mild lift, 4.30 LSD, Ride-Rite bags, on board air, Rancho RS9000 w/MyRide, under bed subwoofer, 160 amp Quick Start large case alternator
Why, yes, I am some kind of geek engineer. Thank you for asking.
MWS make a good point, also even in the 250 class different trucks have lighter or heavier springs in front, which may make a little differrence. Also each lelveling kit raises the front just a little different.
Any way you look at it you can do what you want with little to no modifications.
With the 35 inch tall tire and only a leveling kit, you will most likely get some rubbing on the plastic inner fender liner, and maybe on flex/turns, the front lower bumper. With the 4.75 backspacing, you will most likely rub the leafs on full lock turning. Both can be overcome with a few minor alterations to the truck. Good luck!
9" wide rim you'll want 4.5" backspacing, 10" you'll want 5" backspacing. You could go up to 1/2" more backspacing than that, but you'll be close to the leaf springs then. I have 35x12.50x18s on Diamo 17 Karats which are 10" wide with 5.06" backspacing, the tread is about 1/4" outside the fender and 3/4" from the springs at full lock. The further in you tuck them, the less fender and bumper clearance issues you'll have.
Originally Posted by hallr1158
Thanks again. I believe I have found what I want but there may be a slight issue.
Tires: Pro Comp 35 12.50 R17
Rims: Xtreem Allows Series 7005. They are 17x9, 8 on 170 but 4.75 on backspacing
Will this .2 in variance in the backspacing kill the deal?
Thanks again mwsf220 and ffadragon for your help.
That backspacing on a 9" wheel should be about ideal.
ok so i have another question i was going to adjust the bump stops but i realized that this would hurt my turning when i put my stock size tires on that i use when ever i have to tow long distances. what would you think about putting on 1/4 in wheel spacers?
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