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40's No Lift - 2012 F350 SRW

14K views 45 replies 9 participants last post by  mattastic13  
#1 ·
Has anybody tried putting 40s on a stock ride height 11-14 super duty? I recently became aware of the Fab Fours Fender Kit for the 15+ AlumiDuty's, and that made me genuinely curious if anybody had tried replicating a similar trimming process on the prior body style. I'm going to buy a set of military surplus 40x11r20's and give it a go, I'd like to hear some input before I start this project. Thanks in Advance,
-OG
 
#3 ·
I appreciate good click bait for convo, but lets be serious for one second.

If you took a piece of cardboard and cut out a 40" circle, then put it over the hub, you could easily answer this question for us.

Also, surplus 40x11 will look like Pizza cutters on your truck, if you cannot find pictures of it on the net its a bad idea.

 
#10 ·
I made a post about this awhile back.
I like the idea also and if we get this 2022 it will be something we do. I will more then likely run 37 not 40s. I’m not sure what kit we will go with but it’s all about finding the the right fenders and a competent shop to the cuts installation. The bumpers are big also to accommodate that extra so not to rub.

I think a 3.5 lift and the fender trim would be the best idea if you want to run 40s and have any thought of going off road.

I still need to fit into a parking garage at work. I would much rather have a 6 inch lift but I could not fit into the parking.
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#17 · (Edited)
Well haha...several reasons I suppose. To be a little more clear I'm not really fixed on any specific width but a wider tire means a wider contact patch, and more I contact is more traction is....more, right? Haha
As for why 40's? of say mainly comfort. All roads in Maine, with the exception of I95(which I rarely travel) are subject to Massive Frost heaves In the winter, as well as year round neglect which is probably due to the fact that our state is relatively poor(no hate, just facts). I want as much cushion as I can get. I couldn't imagine owning a truck up here and not having mods to compensate for the all the bumps and craters. Most people go with lifts, but I started my build wanting the round wheel wells stuffed to the max but I didn't know how easily it could actually be done
And something I failed to address so far is I already bought and installed all my aftermarket suspension parts specific to factory ride height...Bilstein shocks, full front end rebuild, variable rate springs etc...
Hopefully this helps people better understanding such a bizarre project. I'm still seeking input on offset
 
#18 · (Edited)
Well i can confidently say your ride quality will not be as good as a smaller tire. Small bumps maybe but as soon as you hit a pothole, the suspension has to push back a 300pound 40” tire vs a 150 pound 35“ or similar. I live in California where the roads are the same if not worse. Once you go past a 35” tire, mpg, ride quality, wear and tear, etc quickly get worse. Not to mention way less power and braking. I have had both 35”s and 37”s now and 35”s are better all around.

And my final token of “consider the following”. Have you seen the price of 40” tires? Are you ready to shell that out every other year on top of the thousands of dollars needed to simply get your truck to fit 40”s?

If you are gonna continue down this road, i would at least say to consider 38”s instead
 
#19 ·
Well i can confidently say your ride quality will not be as good as a smaller tire. Small bumps maybe but as soon as you hit a pothole, the suspension has to push back a 300pound 40” tire vs a 150 pound 35“ or similar. I live in California where the roads are the same if not worse. Once you go past a 35” tire, mpg, ride quality, wear and tear, etc quickly get worse. I have had both 35”s and 37”s now.
And my final token of “consider the following”.

Have you seen the price of 40” tires? Are you ready to shell that out every other year on top of the thousands of dollars needed to simply get your truck to fit 40”s?
Nah dude I've been to Cali and visited a lot of different area out there. You're traffic's worse but it is not the same here conditions wise. 35s don't cut it because that's what I have right now, though they are surely a step up from the 32s that came on it, and hardly an improvement from 33's. I considered 38s but I'm no willing to chance saying "Damn I could've fit bigger tires". Still seeking input on offset
 
#20 ·
Well they wont fit right now thats why you are cutting your truck up? So 42”s will fit if you cut even more off. Also would like to point out the fact that you are gonna cut up your truck before considering getting a lift which is fairly cheap considering the grand scheme of what you want to do? Then you said you are ”wanting to stuff the round fender wells
to the max” yet you are gonna cut anyway? None of what you are saying or wanting to do makes sense to me but to each their own i guess. You will need more than -44 for 13.5 and way more than that for 15.5, to start you off. Good luck
 
#25 ·
And speaking of ride quality, more sidewall is more cushion, that's just science, just like a lower center of gravity is more stable, and that's straight up science. Call me foolish But at least when my next set of rims and tires go on I won't look I spent all my money on a lift kit and couldnt afford big enough tires to fill the wheel wells.
Might as well note that there's only one thing I like about this forum, and that is the fact that whenever I post I almost always have been able to gather real information and a little help before some bozo needs a place to argue cuz his wife's out cheating. Appreciate you boys🤘
 
#26 ·
And speaking of ride quality, more sidewall is more cushion, that's just science, just like a lower center of gravity is more stable, and that's straight up science. Call me foolish But at least when my next set of rims and tires go on I won't look I spent all my money on a lift kit and couldnt afford big enough tires to fill the wheel wells.
Might as well note that there's only one thing I like about this forum, and that is the fact that whenever I post I almost always have been able to gather real information and a little help before some bozo needs a place to argue cuz his wife's out cheating. Appreciate you boys🤘
you come in here covering up your intention by making the excuse of “ride quality”. Everyone here sees right through you and what you are after. You look like a clown and everyone here knows you only want the look and thats the sole reason.

You didnt say that because even you know people will make fun of you which they are. I put you on the same level as high school kids with the carolina squat. At least the squaters arent dumb enough to brick a whole truck hahaha!

LoWeR CeTnEr Of GrAvItY CuS RaCe tRoK XD
im dead
 
#29 ·
Yea? Pretty comfortable smashing tires of against bumpers and body panels? Oh wait, you are gonna cut it up with your reciprocating saw. Cus we wouldnt just want to by better suspension like a normal person...

Now all you need is the 5” spacers to clear the radius arms, actually come to think of it, cut those off too

like heavy says, send some pictures, we are all eager to see your quality work with a reciprocating saw
 
#32 ·
Or I could just buy the 8" bulge fender kit from McNeil. thought it was pretty cool they had a carbon fiber option. Just got off the phone with fiberworx and they said up to 39 inch tires will fit with their 3.5" bulge with little to no lift. . Still trying to get ahold of McNeil to see howuch extra clearance the 8" kit will grant me. I promise I won't cut my truck in half with a sawzall, now Will you please remove yourself from this discussion?
 
#36 ·
Agreed. I could be wrong. But based on all the rolling around I did today with a measuring tape, duct tape, cardboard mocks and a couple rulers here is my conclusion; on a 17 inch rim with somewhere between -18 and -30 offset is going to be key to getting a 13 and a half wide under the truck. I'm definitely going to need the McNeil fenders if I don't want to cut anything. The problem with 40s on a 20 inch rim is you are limited to 15.5 wide general production tires. military standard is 42+ on a 20 inch rim and with the most common widths being 11 and 14... Sleeping on it for now. I've got a buddy with a garage who might have some offset wheels I could use to mock up my plan more efficiently. Will post results
 
#39 ·
Reading this discussion, the concept of "unsprung weight" comes to mind.

Wheels and tires are part of unsprung weight, as are brakes and the rear axles of a Super Duty.

Larger wheels and tires weigh more, increasing unsprung weight. About the only benefit of this is improved isolation from small irregularities in the road surface. I doubt that frost heaves qualify as small irregularities.

There are other detrimental effects of increasing unsprung weight.

You are correct sir. I am trying to utilize a high amount of unsprung mass.
 
#43 ·
Any update. I’m running 37x13.50 with a 6” kit on -44 wheels abs rub slightly at lock abs turning, it bothered me so I went up with a 1.5” spacer. If you count for spring settling, I’d assume with 37x13.50 and -44 wheels I needed 7” lift to clear lock to lock

I can’t wait to see 40s stock! If you do it, look cool it will!
 
#46 ·