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Early AMX AMC 20 Width

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Phitown Hustler View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Phitown Hustler Quote  Post ReplyReply Direct Link To This Post Posted: Mar/14/2019 at 8:21pm
wheel backspace is more important than axle width especially with a leaf spring car. 
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Rebel Machine View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rebel Machine Quote  Post ReplyReply Direct Link To This Post Posted: Mar/15/2019 at 5:50am
Originally posted by Phitown Hustler Phitown Hustler wrote:

wheel backspace is more important than axle width especially with a leaf spring car. 



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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Post Options Post Options   Thanks (0) Thanks(0)   Quote Phitown Hustler Quote  Post ReplyReply Direct Link To This Post Posted: Mar/15/2019 at 6:17pm
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rebel Machine Quote  Post ReplyReply Direct Link To This Post Posted: Mar/16/2019 at 6:54pm
Originally posted by Phitown Hustler Phitown Hustler wrote:

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.




Yes yes yes, pad spacing is the same and perches are on the correct side



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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Post Options Post Options   Thanks (0) Thanks(0)   Quote jpnjim Quote  Post ReplyReply Direct Link To This Post Posted: Mar/16/2019 at 7:03pm
Originally posted by Rebel Machine Rebel Machine wrote:

Originally posted by Phitown Hustler Phitown Hustler wrote:

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.




Yes yes yes, pad spacing is the same and perches are on the correct side



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-



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.
71 Javelin AMX P-code Go pac 360/4spd/3.91's
was Green/green now T/A red w/blk leather

88,89&98 Jeeps
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rebel Machine Quote  Post ReplyReply Direct Link To This Post Posted: May/14/2019 at 7:10pm
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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