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Old 10-18-2013, 09:25 PM
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question about mustang II a-arm pivot points

hi guys --

i'm new here. my name's drew joseph, and i live in western michigan. been interested in cars a long time, and am thinking about trying to do a homemade mustang II ifs setup. i'm a novice at suspension stuff, and have been studyiing how it all works.

i was wondering if anyone here could offer any info on a couple of mustang II dimensions i'm trying to figure out: the side-to-side distance between the centers of the pivot points for the upper & lower a-arms, when viewed from the front of the car.

this company called 'paul horton's welder series' has published a drawing in their catalog that shows the distance between the pivot centers of the control arms being 29.5" for the uppers and 22.25" for the lowers. however, there's also a thread on the h.a.m.b. website in which a member there, who goes by "elpolacko," posted a big writeup on how to fab your own crossmember. from what i gather, this guy is a well-respected member of the forum there, and a professional rod builder in phoenix. his dimensions for the pivot centers differ a bit from the welder series info -- 28" between the upper pivots and 21.75" between the lowers.

any idea which dims are correct? i know this isn't laser-accurate rocket science, and that there's adjustability in the upper slots, but i've been under the impression that these measurements are pretty critical, so that the pivots align properly with the inner steering rack pivots so as to avoid bumpsteer. i'd like to use the correct dimensions in planning my ifs, and am confused regarding this discrepancy.

i'd appreciate any info anyone could offer on this.

thank you!

drew
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Old 10-19-2013, 03:24 PM
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I know both these guys personally, and would do what ever either one of them says. That being said as long as the relationship between the upper and lower arms are the same, one half inch, a quarter inch per side will not make a big difference. The difference may be the height their respective crossmembers mount the steering rack, in that case, both can be correct. I have not used an Industrial Chassis kit, not that there is anything wrong with them, but I have used several Welder Series Uweld kits, and quit making my own because I can't fabricate one for the price of his kit, figuring material and labor.
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Old 10-23-2013, 10:39 AM
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My hat's off to you for working out this suspension stuff for yourself, there's just no substitute for actually going through the motions.

Mustang II's have the advantage of simplicity and pivot points etc. and are pretty easy to measure and work out the relationships, more so than GM, and also not to tough to fabricate. It would be good to actually have a stocker with the engine out that you could take your own measurements from, too bad the actual animal is pretty rare these days.

As you get to understanding the relationships and motions, be open to working w/ other components as the pure Mustang II has it's disadvantages as well as good points, depending on the type of car you're building. The worst would be rack placement, the Mustang was designed w/ tiny 13" wheels and the rack is up pretty high in relation to the spindle c/l...which is OK for a hot rod w/ higher engine mounting, or a sports car w/ lots of setback where the motor can be behind the rack rather than above it. Other cars will have the steering rack and the oil pan going in the same place, which obviously won't do.

My own project that way, built some time back, started with my cutting the crossmember and suspension out of a genuine abandoned '76 Mustang, then substituting GM spindles w/ lower steering placement, then building my own crossmember and lower links to use adjustable Mopar torsion bars, then going to 3rd-gen Camaro spindles and McPherson-type struts for Hemi engine clearance, then switching to a manual Pinto rack...when I was done, the only Mustang II part left was the shocks! Knowing what I was doing with the geometry, when it was all done it worked excellent at any speed, very gratifying. I haven't built my own front suspension on any project since, but I will be on the next one for various reasons.

So anyhow, if you have any specific questions you can ask here also.
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