37x12.5x18 on 6" of lift - Ford Powerstroke Diesel Forum
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post #1 of 14 Old 05-29-2010, 11:02 PM Thread Starter
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37x12.5x18 on 6" of lift

My wheels are 18x9.5 with a -12 offset and 4.75" BS.

I currently have a set of 40x13.5x18 tires that are too big to go on my truck . So it seems i have to go smaller . I didn't want to do this but there's no way i can make them work without dumping money into the truck.

Anyways...I'm looking at a set of 37x12.5x18's. With my current wheels, offset, and backspacing will these fit? What do most guys run on a 6" lift around here? What's the biggest i can run without putting too much money into making them work?

Thanks guys


Also what is everyone's thoughts on the Parnelli Jones Dirt Grips? I found a good deal on them.

2000 F250 XLT SB SC Auto
6" Lift, 37" BFG KM2's, 18" V-Tec Raptors, DIY Intake, Muffler Delete,
Cortex 1950 (), Kenwood Stereo/Amp/Speakers, Extra Cup Holders!! ( )




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post #2 of 14 Old 05-30-2010, 07:04 AM
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I have a 6 inch lift, and I run 35/12.50/20 on moto metal 955's and they fit very well, i think, from looking at lock to lock that 37's would be VERY close to rubbing, however, with fender eliminators, 37's fit easily! if you do put 37's on, let me know, I wold like to know if they fit lock to lock

05' F250 FX4 Lariat
35x12.50 Trail Grapplers on 20'' moto metal rims
MBRP 3.5" downpipe, 4" back, 5" Tip
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K&N Intake
ProComp 6" Lift
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post #3 of 14 Old 05-30-2010, 07:18 AM
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This is a 4" with 37x12.50 BFG KM2's on 18" XD Series Monster, 4.5" backspacing. There was no trimming needed at all to make these work.
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post #4 of 14 Old 05-30-2010, 10:39 AM Thread Starter
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Is your truck a leaf or coil spring?

2000 F250 XLT SB SC Auto
6" Lift, 37" BFG KM2's, 18" V-Tec Raptors, DIY Intake, Muffler Delete,
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post #5 of 14 Old 05-30-2010, 01:27 PM
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That truck is my buddies, its a 2002, and its leaf spring. I have a 4" Rancho kit in my 2008, and I didnt have to trim at all either. I run 37x12.50x20's with 5" backspacing. Clink the link to see a couple pics below.

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post #6 of 14 Old 05-30-2010, 04:08 PM
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i have some 38 dirt grips,they are really good i like them alot.work good on road,in sand,pretty good in mud if you can spin them

96 f-350 cclb 4x4 auto
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post #7 of 14 Old 05-30-2010, 04:15 PM
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I have 6.5" of lift with 37" km2s and the only rub when i turn into a something with a big ledge, like a curb or something. Other than that they are great.

2013 F250 Lariat 4x4 Loaded. H&S mini maxx, 5" exhaust, S&B intake, and EGR delete, AMP steps, tonneau cover

2011 F150 Ecoboost FX4 Screw. All stock except for a livernois Tuner. SOLD!

Early 99 CCLB Pro comp 6.5" lift w 18" hulk wheels wrapped in 37" KM2s, Amp steps, Straight pipe, AIS intake, Dp Tuner, isspro gauges (boost,trans,pyro), 05 front clip, traction bars, 6.0L trans cooler, built trans.SOLD!!
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post #8 of 14 Old 05-30-2010, 08:26 PM Thread Starter
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A numerically higher backspacing will push the tire out more or pull it in more?

2000 F250 XLT SB SC Auto
6" Lift, 37" BFG KM2's, 18" V-Tec Raptors, DIY Intake, Muffler Delete,
Cortex 1950 (), Kenwood Stereo/Amp/Speakers, Extra Cup Holders!! ( )




115,000 miles and rolling strong
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post #9 of 14 Old 05-31-2010, 03:50 AM
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It will pull it in more. But on your truck, you will want a 4.5" backspacing to keep the tires off the leaf springs. We tried my stock 2008 wheel with a 37x12.50 on the 2002 truck, and it rubbed hard on the leaf springs.
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post #10 of 14 Old 05-31-2010, 11:24 AM
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i don't understand why you would not lift your truck higher to make the forties fit instead of losing money on selling the whole set???? doesn't make sense.
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