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Early AMX AMC 20 Width |
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Rebel Machine 
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Joined: Jul/03/2007 Location: Western Il Status: Offline Points: 5122 |
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 Topic: Early AMX AMC 20 WidthPosted: May/14/2019 at 7:10pm |
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Went out and measured the rear axle in the '69 AMX. I removed the rear tires & brake drums then clamped a section of 1" square tubing to each axle face then measured between them. Measures 58 3/4" Also measured the leaf spring width, it's 43 1/2". -Steve- |
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jpnjim
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Joined: Nov/25/2007 Location: New England Status: Offline Points: 2752 |
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Posted: Mar/16/2019 at 7:03pm |
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5" backspacing 16x8's used to be more common than 15x8's. Factory Jeep (5 on 4.5" TJ's) 15x8's are 5.5" backspacing so that's in the ballpark anyway. XJ, ZJ & TJ 15x7's are 5.25" backspacing, so they're also in the ballpark but narrower obviously. I'm not so much suggesting you use Jeep wheels, but maybe look to aftermarket wheels meant for Jeeps.
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71 P-code 4spd Javelin/AMX
some Jeeps and some Fords |
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Rebel Machine
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Joined: Jul/03/2007 Location: Western Il Status: Offline Points: 5122 |
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Posted: Mar/16/2019 at 6:54pm |
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Might be a bit wide for the AMX, specs on that rear axle show 60.5" axle flange width. Right now an 8" wide wheel with a 5" backspacing is a perfect fit. Problem is there aren't that many 8" wheels with a 5" backspace. The Weld Prostar is but the set I bought a few years ago had a crazy amount of run-out and for some reason the front ones tore up a pair of front hubs. I got rid of them. Most appear to be 4.5" or 5.5". -Steve- |
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Phitown Hustler
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Joined: Mar/14/2019 Location: Philly Status: Offline Points: 124 |
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Posted: Mar/15/2019 at 6:17pm |
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most late model AMC wheels had 4.5 bs. In a leaf spring car with 275 rubber on a 4.5 wheel you are very close to the spring. For the AMX Likely you will need to move the springs inboard and mini tub to fit big rubber regardless of axle width. Just not enough room in the wheelhouse
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Rebel Machine
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Posted: Mar/15/2019 at 5:50am |
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That's what I'm really after. The stock AMC 20 in the '69 AMX limits the choice of wheels due to it's width. I'm going with a 9" with the new engine. -Steve- |
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Phitown Hustler
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Posted: Mar/14/2019 at 8:21pm |
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wheel backspace is more important than axle width especially with a leaf spring car.
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Steve_P
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Posted: Mar/14/2019 at 7:22pm |
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53.25 over the tube flanges. RH tube is .75 longer than LH. 43.56 CLs on spring mtg holes.
If you want pinion offset, let me know as.this gets stored Saturday and that's it for measurements
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Steve_P
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Posted: Mar/14/2019 at 6:39pm |
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Who said he was using an AMC 20? It's clear to me that his plan is to not use one
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Phitown Hustler
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Posted: Mar/14/2019 at 6:29pm |
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Why bother with an AMC 20 in any performance car unless their is no other option? Here is a crate rearend that will bolt in and offer myriads of options and of course be bulletproof. https://www.currieenterprises.com/CE-JMJ8692X Yes yes yes, pad spacing is the same and perches are on the correct side
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Rebel Machine
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Posted: Mar/14/2019 at 4:14pm |
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If it's not a bother, yeah. Sounds like the standard measurement is axle flange to axle flange (mating surface of wheel). -Steve- |
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Rebel Machine wrote: