12 bolt swap

The Storm · Posted: Mon Mar 17, 2008 6:55 am Post subject: 12 bolt swap

I have A 84 with a 7.5 that am swaping out for a 12 bolt. my ? is,
are the brake lines on the 12 the same as the 7.5 or do i need to change the fittings?
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old_coot · Posted: Mon Mar 17, 2008 8:44 am Post subject:

I haven't done it to the El Camino yet but I did this change to an 80 Malibu so that should be the same thing and you have to change about everything but it's not difficult---the worst part was getting the right size wheelcylinders for the brakes to be balanced and I cannot remember what I ended up using but I seem to recall getting some with a 3/4 inch diameter--I just can't quite remember it those were the last ones I got --but that ought to get you in the ballpark anyway----I did that in about 1986 so that is the reason for the memory problem----plus I am getting old..............Dan
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I don't think I have ever had a car that was "FINISHED"........unless it was totaled.

antmar · Posted: Tue Apr 01, 2008 7:14 pm Post subject: 12 bolt swap

i have an '84 that i want to swap in a 12 bolt too, what model car differential will swap into a 1984 el camino?
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mk454

The Storm · Posted: Tue Apr 01, 2008 10:48 pm Post subject:

Mines came out of a 72 Chevelle
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old_coot · Posted: Tue Apr 01, 2008 10:57 pm Post subject:

I thought the 72 was too wide and needed narrowng---I believe the one I used was out of a 67 chevelleand even though it actually bolted up using the stock control arms the pinion angle was way wrong so I had to drill some foles closer together to get it right..............Dan
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I don't think I have ever had a car that was "FINISHED"........unless it was totaled.

antmar · Posted: Wed Apr 02, 2008 6:59 am Post subject: 12 bolt swap

thanks, a co-worker told me that my '84 elcamino was based on a monte carlo, and i should look for a 12 bolt out of a mid 80s monte carlo ss. but i think i will take measurements and go to you-pull-it.
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mk454

The Storm · Posted: Wed Apr 02, 2008 7:11 pm Post subject:

MarkZ28 · Posted: Thu Apr 03, 2008 8:08 pm Post subject:

I forget now, but someone makes control arms that make a 12 bolt rear a true bolt in swap, probably Hotchkiss, Strange, or Moser.

The Storm · Posted: Mon May 26, 2008 3:35 pm Post subject:

Here is a update on the 12 bolt. it went in with no probs, brakes lines fit,
The upper an lower controll arms came from SSM, South Side Machine co.
The kit is for 64 to 72 A body 12 bolt to adapt to 78 to 87 10 bolt G body.
[img]

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dougs85 · Posted: Mon May 26, 2008 4:49 pm Post subject:

Thanks for the update and the useful info Ted. Looks great!

Doug
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85 El Camino 305, TH350, K&N, dual exhausts
87 El Camino 305, 2004R, K&N, dual exhausts
1964-1/2 Mustang conv, 260 V8, dual exhausts
2002 Jaguar XJ8, 2000 Harley Road King
Lakewood, CO

MarkZ28 · Posted: Sat May 31, 2008 5:41 am Post subject: Re: 12 bolt swap

bigjames4xl · Posted: Sat May 31, 2008 6:04 am Post subject: Re: 12 bolt swap