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Old 07-12-2010, 05:27 PM
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Borg Warner 9 to 10 bolt

Will a 10 bolt bolt right into where my Borg Warner 9 bolt resides currently? I have a 1988 Trans Am GTA and can't find a 4.11 gear set or posi clutch rebuild kit without buying the whole posi kit.... I would rather go to a 10 bolt anyway if it'll just bolt in... Please Help!!!

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Old 07-12-2010, 06:13 PM
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I split your post into a new thread since you posted to a very old thread . Perhaps a better response with a new thread
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Old 07-12-2010, 07:23 PM
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Quote:
Originally Posted by Mullet1
Will a 10 bolt bolt right into where my Borg Warner 9 bolt resides currently? I have a 1988 Trans Am GTA and can't find a 4.11 gear set or posi clutch rebuild kit without buying the whole posi kit.... I would rather go to a 10 bolt anyway if it'll just bolt in... Please Help!!!
Some reading. If you are talking about the 3rd. gen f-car's weak 7.5/7.625" 10 bolt diff, I believe you might be heading in the wrong direction.

If you're talking about the corporate 8.5" 10 bolt, that takes a lot of work and/or cash to modify for use in the 3rd gen.
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Old 07-12-2010, 08:10 PM
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A 7.5 10 bolt will bolt in where your Borg Warner is now. This is a direct swap. I recommend that you find a '90 to '92 10 bolt because the axles were upgraded from 26 spline to 28 spline in '90. The '93 and later 10 bolt will also bolt in your car, but it will be about 2 inches wider. I also recommend replacing the Auburn differential with an Eaton Posi. Be sure to check the gear ratio and get the one that you want.
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