Author Topic: 12 bolt axle shaft length?  (Read 2488 times)

JKZ27

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12 bolt axle shaft length?
« on: December 04, 2011, 04:15:01 AM »
Hey Guys, I did a 12 bolt swap last weekend on my 68 and now i notice my brake drums are about 1/4"(visual) more away from the backing plate than when the 10 bolt was in (also compared to the OE 12 bolt in my 69). So, my questions will start with...does anyone know the correct length of the 12 bolt drum brake axle shaft? I spent a few hours trying to research it but found what I thought to be conflicting information, sources stating anywhere from 29.5", 29 9/16" on up to 30.5". I'm trying to get an idea whats wrong based on some measurements and some known figures before taking the axles back out. I'm thinking someone put some Chevelle or second gen axles in this thing before I got it but I want some reliable measurements to go off of. I realize I've got alot of things to verify before jumping to any conclusions but that measurement is bugging me.  :)   Thanks for any help.

John.
John
69 RS/SS Cortez Silver, L48 MC1
68 RS Ash/Ivy Gold 327EFI M20

bertfam

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Re: 12 bolt axle shaft length?
« Reply #1 on: December 04, 2011, 04:25:47 AM »
All first generation Camaro 12 bolt axles are 30 spline and 30.5" overall length. The first generation Camaro 10 bolt axle is 28 spline and 29 33/64" overall length.

Ed

JKZ27

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Re: 12 bolt axle shaft length?
« Reply #2 on: December 04, 2011, 02:41:50 PM »
Thanks Ed
A lot of replacement axle shafts are listed at 29.5".  Any ideas why? Different measurement points?
John
69 RS/SS Cortez Silver, L48 MC1
68 RS Ash/Ivy Gold 327EFI M20