Box Modifications: Tire Clearance
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Joined: Aug 2002
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From: Saskatoon SK Canada
Box Modifications: Tire Clearance
This is just a rough diagram but shows my point.
I'm wondering how much room should I leave between the fender and inner tub. Figure A and B on diagram. For the inner tub I'm looking for a good medium size and on the outer fender aesthetically pleasing.
As it stands with SRW I have 2.5" outer fender clearance at the top but the fender curves back at the bottom. I'm thinking at least 3" medium. What do you stocker guys have on your F-1's and F-2/3's?
As for the inner tubs I was thinking of 3". I got about 8" per wheel tub to play with but I don't want to loose my bed space.
What do you guys think?
I'll have the Roast Duck
Joined: Jul 2002
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From: Northshore, MN
I don't have mine together yet, but consider when your wheel and axle traverse a bump that the wheel will be at an angle, with the upper half going inward and the lower half going outward towards the fender. As long as your wheels sit below the fender line enough, it shouldn't be an issue. tuck them up in there, and then it will be an issue of clearance. Putting on a heavy load will bow your tires out only at the ground, so that shouldn't be an issue either. However, the wider your axle outbound of the suspension, the more the movement. 4x4 guys have articulation ramps that they test their trucks on to see how much clearance they have. IMO, slowly backing up on a ramp with one side might give ya an idea of how much clearance you'll have. Just some points to consider til someone gives ya a measurement.
I'll have the Roast Duck
Joined: Jul 2002
Posts: 9,622
Likes: 110
From: Northshore, MN
I just remembered your truck has the f350 axle. I can measure my '78 f150 box. The idea is that the box is wider, but has inner tubs. The dually has the same inner tubs, but the box side extends outward covering the dual wheel. My F1 has no tubs, but I bet the box isn't as wide as the '78, thus making up for it. Below is what I first typed, hope it ain't too confusing, lol.
A '78(other years, too?) dually bed measured from the inner fender lip to box-side, and left box-side to right box-side, would give ya the measurements you need. Armed with that, you can compare the inner box sides to your 54" measurement, and add the '78 inner fender lip to box side measurement. That should be how much outward the fender needs to be. Also the 54" measurement inboard for the tub part that all 70's trucks have.
A '78(other years, too?) dually bed measured from the inner fender lip to box-side, and left box-side to right box-side, would give ya the measurements you need. Armed with that, you can compare the inner box sides to your 54" measurement, and add the '78 inner fender lip to box side measurement. That should be how much outward the fender needs to be. Also the 54" measurement inboard for the tub part that all 70's trucks have.
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Lead Driver
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From: Saskatoon SK Canada
Just Ford didn't make a dually pickup till 1980 and my axle is a chassis cab version so it is much narrower. The width between my stock inner tubs is only 1" narrower than the 78 F-250's stock box.
Someone with a stock F-2/3 truck could you measure the distance between the tire and outer fender lip. I probably could calculate it from the chassis diagram but a real measurement would help.
Someone with a stock F-2/3 truck could you measure the distance between the tire and outer fender lip. I probably could calculate it from the chassis diagram but a real measurement would help.
Last edited by 51dueller; Aug 7, 2007 at 11:12 PM.
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Joined: May 2004
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From: MN - NW of Twin Cities
Nathen,
I've heard you should provide not less than 1" clearance between that portion of sidewall projecting the farthest out and the fenderwell or tub. I would feel more comfortable with 1 1/2" minimum however.
I've heard you should provide not less than 1" clearance between that portion of sidewall projecting the farthest out and the fenderwell or tub. I would feel more comfortable with 1 1/2" minimum however.
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Roast em' if you got 'em
Joined: Mar 2005
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From: Rio Rancho, NM
Couldn't you just take several measurements between the tires and the inner fenders from a handful of new model duallys? That should give you some idea of what you need for clearance.
I can't wait to see it
Bobby
I can't wait to see it
Bobby
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Lead Driver
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From: Saskatoon SK Canada
Looking at some body builder diagrams for a 1970 truck. They have 48.5-49" between bed tubs and the distance between the tires is 53". 53-49=4" So they only had 2" of clearance between the box and tire. I measured my brother's Nissan Frontier and it has 3". I just looked at a 48 F-1 chassis diagram and it recommends 1.65". I think I'll go 3" for peace of mind.
Now I just need to figure out how much overhang I need for my fenders.
Now I just need to figure out how much overhang I need for my fenders.
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