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Old 02-26-2011, 04:42 PM
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86 Trans Am rear axle ?

There is one available nearby. It's a posi and 2" wider than the original from my 51 Chevy. Someone refered to it as a weird Australian unit. I've researched and it prolly is the Australian Borg Warner . I think it has 3:50ish gearing. I'd really like to have the rear discs but I don't want to install an inferior axle. Any info would be appreciated.

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Old 02-26-2011, 04:46 PM
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Quote:
Originally Posted by Mike Woodman
There is one available nearby. It's a posi and 2" wider than the original from my 51 Chevy. Someone refered to it as a weird Australian unit. I've researched and it prolly is the Australian Borg Warner . I think it has 3:50ish gearing. I'd really like to have the rear discs but I don't want to install an inferior axle. Any info would be appreciated.
It depends on what engine you have in your '53 and its output. If it's the stock engine, no problem.

Obviously, it'll need to have the spring perches, etc. changed to match your set-up. The width can usually be taken care of by choosing the right offset/backspacing of the wheels.
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Old 02-26-2011, 07:14 PM
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The BW 9 bolt had 2.77 and 3.27 gears in most cases. The 2.77 used a 2 series differential and the 3.27 used a 3 series differential. There were a few rare 3.45 gears in these. The axle tubes will be the smaller 2 5/8 inch, which makes it harder to install comon spring perches. These rear ends are good enough for a stock small block, but won't take a large amount of abuse. They have a small 7.75 ring gear, so they are just a little better than the 7.5 GM rear end. They also use a cone type differential which is difficult to rebuild.
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Old 02-26-2011, 07:36 PM
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I would try to find an 8.5 10 bolt. Came in a lot of GM trucks. They are pretty strong. Also the ford 8.8 is a good one too. Most ot the Exploders had 3.73 gears and posi's in them.
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Old 02-26-2011, 08:05 PM
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Thanks for your help. I'll be putting a 283 in the car and don't plan on burning much rubber. The tube did look rather small but as the axle is still in the car I thought it might just the way I was looking at it. I did like the idea of rear discs and the pbr aluminum calipers but I hate to have a weak rear end. Any posi axle seems to go for 200+ around here. Mike
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