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Elder User
Joined: Apr 2016
Posts: 633
Likes: 2
From: So. Utah
Sure it can be done, just depends on how much money you want to spend. I hope you're front end ball joints, tie rod ends, shocks and brakes etc. are in really good shape because those 37" tires are heavy and will give the parts a workout.
Fleet Mechanic
Joined: Jan 2012
Posts: 1,841
Likes: 6
I wouldn't go any bigger than 35's with a 4" lift. I'm willing to bet that truck you posted a pic of rubs more than a little bit on the leafs than whoever posted it was willing to admit at full lock especially on uneven ground like turning into a drive way especially with the negative offset wheels. If you want to do it go ahead but I wouldn't try it on mine or recommend doing it to you or anyone. With big heavy 37's a regear is a really good idea as well no matter which motor you have.
Postmaster
Joined: Aug 2015
Posts: 3,146
Likes: 32
From: Maryville, TN
I run 37x12.50's on 18x9 +1 offset with a 3.5" lift on my '16 f250. I trimmed a tiny bit off the drivers side liner and don't rub anything, but it is very close. I truly think if you tried this on a pre 08 truck, you would end up with sheetmetal damage at the bottom off the fender. Big difference between not rubbing in your driveway and not rubbing when you pull into a parking lot with a big rise.
Tuned
Joined: Sep 2014
Posts: 368
Likes: 0
From: Ventura, Ca
I run 37x12.50's on 18x9 +1 offset with a 3.5" lift on my '16 f250. I trimmed a tiny bit off the drivers side liner and don't rub anything, but it is very close. I truly think if you tried this on a pre 08 truck, you would end up with sheetmetal damage at the bottom off the fender. Big difference between not rubbing in your driveway and not rubbing when you pull into a parking lot with a big rise.
exactly! rubbing in a parking lot or a driveway is way more forgiving than rubbing on a washboard or rutted road at any kind of speed or crawling up a rutted road with rocks.
99 to 07 have the same front fenders. the front suspension is different but the body is the same
fitting 37's with only a 4" lift is a tough nut to crack with our trucks.
I have a 4.5-5" lift with 36" toyo mt's (315-70-18) and I had rubbing issues with the rear inner wheel well liner while turning up into a low standard driveway. I'm running 18x9 4.5 bs 0 offset wheels. back space and offset is super important so you don't rub on the leafs at full lock.
I wanted to run 37's but I didn't want to have to trim my bumper and the rear wheel well liner.
I also think 37's would come close to hitting the outer fender lip during full compression. just look at that picture again and you can see where the tire is going to hit if it does any off roading. it's easier with a 6" lift but....
I did see that somebody was making bolt on fiberglass fenders with the bigger 08-16 fender openings. they look really good with the newer beds too.
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Postmaster
Joined: Aug 2015
Posts: 3,146
Likes: 32
From: Maryville, TN
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Tuned
Joined: Sep 2014
Posts: 368
Likes: 0
From: Ventura, Ca
the coils only change the amount of useable backspacing. it does nothing for a taller tire. plus your still hampered by the smaller wheel well opening of the fender. I'm still considering trying out those fiberglass fenders with the 08-16 openings. i'll post a link.
Postmaster
Joined: Aug 2015
Posts: 3,146
Likes: 32
From: Maryville, TN
Originally Posted by darkjedi351
the coils only change the amount of useable backspacing.
My earlier post agrees with exactly what you've said though, he's not fitting 37's on his truck with a 4" lift without major rubbing or heavy trimming(of sheetmetal). He will be into the radius arms hard, long before it clears the bottom of the fender, even in everyday driving. My 37's fit with a 3.5" lift on because of my limited backspaceing, 9" wide wheel and a larger opening. If I tried to run a 10"+ wide wheel and -44 backspacing, I wouldn't be able to get it out of the driveway. And if I tried hard core off-roading my truck, I'd rip the liners out of the wheel well. While my trucks not a street queen, and I use 4wd regularly, I'm never going to use it for hardcore trail riding, rock crawling or mudding. It's the wrong vehicle for those application anyway.
Tuned
Joined: Sep 2014
Posts: 368
Likes: 0
From: Ventura, Ca
This answers your question. Because you can get away with less back spacing, you have more room to turn a taller tire.
My earlier post agrees with exactly what you've said though, he's not fitting 37's on his truck with a 4" lift without major rubbing or heavy trimming(of sheetmetal). He will be into the radius arms hard, long before it clears the bottom of the fender, even in everyday driving. My 37's fit with a 3.5" lift on because of my limited backspaceing, 9" wide wheel and a larger opening. If I tried to run a 10"+ wide wheel and -44 backspacing, I wouldn't be able to get it out of the driveway. And if I tried hard core off-roading my truck, I'd rip the liners out of the wheel well. While my trucks not a street queen, and I use 4wd regularly, I'm never going to use it for hardcore trail riding, rock crawling or mudding. It's the wrong vehicle for those application anyway.
My earlier post agrees with exactly what you've said though, he's not fitting 37's on his truck with a 4" lift without major rubbing or heavy trimming(of sheetmetal). He will be into the radius arms hard, long before it clears the bottom of the fender, even in everyday driving. My 37's fit with a 3.5" lift on because of my limited backspaceing, 9" wide wheel and a larger opening. If I tried to run a 10"+ wide wheel and -44 backspacing, I wouldn't be able to get it out of the driveway. And if I tried hard core off-roading my truck, I'd rip the liners out of the wheel well. While my trucks not a street queen, and I use 4wd regularly, I'm never going to use it for hardcore trail riding, rock crawling or mudding. It's the wrong vehicle for those application anyway.
I think you meant more backspacing or less offset
the leaf spring trucks can use a max of 4.5" b.s. and the 05-16 coil spring trucks can go up to 5.5" of back spacing.
it's a tricky game trying to stuff a larger tire under our trucks. too much backspace and you end up hitting the leafs or radius arms(depending on suspension) and if you go too little backspacing you end up with the tire sticking out of the fender too much and hit the bumper and rear fender edges when turning along with hitting the upper fender lip during suspension cycling.
what are the specs on your wheels? did your truck come with 4.30 or 3.73 gears stock and how much of a mpg/power differences did you have by going to 4.88's? 4.88's are my next upgrade.
Postmaster
Joined: Aug 2015
Posts: 3,146
Likes: 32
From: Maryville, TN
Yes, I meant to use the word offset, not backspacing.
My wheels are 18x9 fuel mavericks, +1 offset. My truck came with 3.73's, but it is geared equivalent to a 4.30 truck now. I regeared at the same time I put the 37's on, so not sure of how the gears alone do, but I only lost 1-1.5 mpg daily and my performance is about equivalent to stock tires and 3.73's. Very happy with it.
I'm currently sitting at 10.4 mpg, I do 0 interstate or long distant hwy driving daily, here is a link to the acceleration.
My wheels are 18x9 fuel mavericks, +1 offset. My truck came with 3.73's, but it is geared equivalent to a 4.30 truck now. I regeared at the same time I put the 37's on, so not sure of how the gears alone do, but I only lost 1-1.5 mpg daily and my performance is about equivalent to stock tires and 3.73's. Very happy with it.
I'm currently sitting at 10.4 mpg, I do 0 interstate or long distant hwy driving daily, here is a link to the acceleration.
Fleet Mechanic
Joined: Jan 2012
Posts: 1,841
Likes: 6
Haha there is no way you have 38's and a 4" lift the tires would rub going straight unless you have some crazy cut out flares and then your still not doing much turning much less suspension articulation. You either don't know how big of a lift or tires you have I've had 38's they are huge. And 46's that's even funnier there is no way in hell thats happing.