67-70 9" swap - Vintage Mustang Forums
 
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post #1 of 10 (permalink) Old 08-10-2019, 11:00 PM Thread Starter
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67-70 9" swap

Will a stock 9" rear from a 67-70 mustang bolt into a 71-73 mustang,"Is it a bolt in deal ? Are the spring perches in same location?" About an inch difference in width? Thanks!

Last edited by 3X2GTO; 08-10-2019 at 11:07 PM. Reason: added info
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post #2 of 10 (permalink) Old 08-10-2019, 11:34 PM
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Google says they all have a 43" center to center spring width.

Width is 59.25" for 67-70, 71-73 is 61.25".

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post #3 of 10 (permalink) Old 08-11-2019, 08:08 AM Thread Starter
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I saw that, just want to make sure there are no other issues when swapping, Thanks.
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post #4 of 10 (permalink) Old 08-11-2019, 08:24 AM
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Width is different, but it'll bolt right in. Might be issues with driveshaft length and/or u-joints mating depending on what is currently in the car.

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post #5 of 10 (permalink) Old 08-11-2019, 11:42 AM Thread Starter
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My car is a 9", but I THINK the housing is bent, still checking that out, if it is I'd like to go with a 67-70 to pick up a little more tire room.
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post #6 of 10 (permalink) Old 08-11-2019, 12:21 PM
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Originally Posted by 3X2GTO View Post
if it is I'd like to go with a 67-70 to pick up a little more tire room.

The narrower rear end will not increase the "tire room". It will only change the backspace requirement for the wheels to keep the tire centered in the wheel house. With the narrower rear end you can use wheels with less backspace for that "deep dish" look that was popular in the 60's and 70's.
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post #7 of 10 (permalink) Old 08-11-2019, 04:37 PM Thread Starter
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A narrower rear will move the wheel/tire in, which means less sticking out pass the wheel lip. I did the same on my GTO and can now run little wider tire underneath the car. Just wasn't sure on the mustang whether the 70 rear would bolt in without mods. Hemikiller is confident it'll work, so I'll give it a try and post results. Thanks!
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post #8 of 10 (permalink) Old 08-11-2019, 06:41 PM
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A narrower rear will move the wheel/tire in, which means less sticking out pass the wheel lip.

A wheel with more backspace will move the wheel/tire in with the same rear end that's in it now.
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post #9 of 10 (permalink) Old 08-11-2019, 07:06 PM
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Just a little less backspace you will have to order some wheels or use spacers.
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post #10 of 10 (permalink) Old Today, 10:09 PM Thread Starter
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A wheel with more backspace will move the wheel/tire in with the same rear end that's in it now.
Probably going with a Moser 9", no sense in going back to a stock width. Thanks!
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