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Old 01-03-2004, 06:36 AM
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Would it be possible to shorten 12 bolt?

I have a 69 Camaro that has a 70 Chevelle 12 bolt rearend in it.How much trouble would it be to cut some off of the tubes and move spring perches,get new axles, to make it size it is supposed to be.The reason i am even considering it is i like the 410 posi. set up that is in it.Are these 12 bolt Chevelle rearends worth as much as a rear for a first generation Camaro $1200-$1500?I am scared that if i find a correct one it will be worn out and cost big bucks to rebuild

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Old 01-03-2004, 06:45 AM
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Whoever put a Chevelle rear in a Camaro, has already done a bunch of work. Chevelles have coil springs, Camaros have leaf springs.

The housing of a 12 bolt is easy to narrow, but the axles are a pain. They are tapered and cutting new splines isn't always practical. Depends how much it has to be narrowed. You can but narrowed axles for these rears. Make sure that you know your axles length, before cutting your housing.

I don't think you could get much for that Chevelle rear now, as all the mounting pads must have been cut off.

How much oversize is it? Maybe you can get a different offset wheel to get it to work.
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Old 01-03-2004, 08:58 PM
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If the rear end you're going to use is off-set (one axle shorter than the other) obtain another of the "short axles" and cut the housing so you could use two short axles.
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Old 01-04-2004, 06:53 PM
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I once obtained a 12 bolt w/posi from a 70's Trans Am for a 69 Camaro I was restoring. I didn't notice until I was installing it that it was quite a bit wider than the original 69 Camaro axle. I quckly sold the Trans Am axle and obtained the proper 12 bolt.

The process to make the Pontiac axle fit was more than I could accomplish at home. It is impossible to shorten the axle tubes of a housing without having a very robust jig to hold everything in proper alignment as it is welded back together. There is just too much heat generated in the welding process that will quickly warp the axle tubes if they are not secured.

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Old 01-05-2004, 01:03 AM
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A jig is an absolute must in narrowing any housing. If you are just going to do one or two, pay someone to do it. If you are going to do quite a few, buy a jig. I made a jig for 9" rears. I've done 3 of them now and the more I do the more cost effective the jig becomes.
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