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1948 - 1956 F1, F100 & Larger F-Series Trucks Discuss the Fat Fendered and Classic Ford Trucks

Boxing the frame or not

 
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Old 05-31-2008, 11:26 AM
W.Grills
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Boxing the frame or not

I was wondering if it would be better to completely box the frame, or just over the front ifs and rear axle. I see in all the magazines they only partially box the frame. Does the frame need to flex? Is it too stiff if fully boxed?
 
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Old 05-31-2008, 01:25 PM
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The general consensus is to box a frame where an independent suspension can do it's job. So if you have an IFS, then boxing the front makes sense, as the IFS will do the work the frame originally did with leafs. Leafs are an up and down only movement. The frame allows one side to move up and down more or less than the other side, thus frame flex. So unless you have an IRS, then boxing the rear will only make for a harsher ride, since it won't allow the frame to flex.
 
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Old 05-31-2008, 01:32 PM
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I agree by boxing the frame it causes the suspension to do all the work. On these old trucks the frame was part of that suspension. On my 51 I am boxing the frame front to back and building a tubular center section but I am also doing IFS and IRS so I do not want any chassie flex. This will allow me to tune the suspension and not need to factor in the chassie flex.

Kevin
LFD Inc.
 
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Old 05-31-2008, 01:58 PM
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I boxed my the frame on my 55 F-100 and did the same thing with a tubular crossmember. Here is a pic of my setup . The tubular crossmember was original designed to prevent chasis flex, however it helpded beef everything up enough that I can put whatever kind of horsepower down I want.

(hopefully)


ben




Originally Posted by Rokcrln View Post
I agree by boxing the frame it causes the suspension to do all the work. On these old trucks the frame was part of that suspension. On my 51 I am boxing the frame front to back and building a tubular center section but I am also doing IFS and IRS so I do not want any chassie flex. This will allow me to tune the suspension and not need to factor in the chassie flex.

Kevin
LFD Inc.
 
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Old 05-31-2008, 02:51 PM
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Where do you guys get the tubular crossmembers?
 
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Old 05-31-2008, 03:41 PM
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Originally Posted by lowtrkn2k View Post
Where do you guys get the tubular crossmembers?
I made mine with a tube bender and a tube notcher.
 
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Old 06-01-2008, 09:46 AM
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Thanks guys. I'm planning on a IFS and a solid rear axle with air bags. Wasn't sure how much to box. A bit less welding I guess.
 
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Old 06-01-2008, 10:21 AM
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Please, box that thing in, boxing in sections just transfers the stress, frames that flex are doing work that the suspension should be doing
 
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Old 06-01-2008, 03:55 PM
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Originally Posted by create View Post
I made mine with a tube bender and a tube notcher.
Yep that is along the same idea I will be doing. I have been building tube chassies for a few years now both for the street and offroad. Here is one of my tube toys!







And a future 500hp street tube toy waiting for it's turn in the fab shop!



Kevin
LFD Inc.
 
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Old 06-01-2008, 05:19 PM
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Originally Posted by Rokcrln View Post
Yep that is along the same idea I will be doing. I








Kevin
LFD Inc.

Looks like an easy way to change the oil
 
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Old 06-01-2008, 08:32 PM
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Originally Posted by fatfenders56 View Post
Please, box that thing in, boxing in sections just transfers the stress, frames that flex are doing work that the suspension should be doing
I boxed mine completely. just made sense to me?? Runnin heidts superride II and heidts 4-bar ride is great!!
 
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Old 06-02-2008, 12:26 AM
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The more I think about it. I think I want an air suspension. I was checking out No Limit this evening. I'm thinking it looks very good. Wondering how it will work the Flathead I'm using.
 
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Old 06-02-2008, 07:10 AM
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Originally Posted by W.Grills View Post
The more I think about it. I think I want an air suspension. I was checking out No Limit this evening. I'm thinking it looks very good. Wondering how it will work the Flathead I'm using.
remember that you need the associated parts for the suspension too.
compressor, air tank, hoses, valves. switches (or other control)..

I am having a devil of a time finding places for mine (and its only for the rear).

Tank under the pass door (where the battery used to be)
compressor (I think) under the rear fender next to the gas tank (outboard of the frame).
valves.. need 2 per air bag (1 up and 1 down).

Sam
 
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Old 06-02-2008, 11:19 AM
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sdetwell, couldnt the compressor and solinoids fit under the bed along the frame on a bracket between frame and drive shaft?
 
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Old 06-02-2008, 11:41 AM
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well, I have my exhaust partially up in there.. and the triangulated rear suspension parts.. amazing how much side effect (collateral damage!) one decision can have.
(and how little room there really is!)

I am constantly rethinking the triangulated rear.. as the mechanics are in the way constantly..

The long tube headers had to be high enough to get the tailpipe sections over the tranny cross member, else they would drag on speed bumps. (as I worry about my running boards).
the long lower trailing arms of the custom rear eat up a lot of frame rail space but provide good anti wheel hop/axle twist.

the triangulation provides good lateral stability, but take up a bunch of upper inner frame rail space.. and may block out the ability to take the exhaust up and over the axle.
(where the fuel line runs!) but I can't go out the side cause the trailing arms are in the way..
I can unbolt this thing in a heartbeat and go 4 link.. but wanted something different.. and its been an 8 yr journey.

had to raise the bed 3/4in to account for the drop when the bags are down and the c-notch. and am rethinking how I did that.. added a spacer on top of the cross members, which forces longer, non-standard bolts from the bed strips... adding a different spacer at the chassis would make things more normal..

anyhow, its more a complex puzzle than I had anticpated..

Sam
 

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