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9 bolt or 10 bolt?

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Old 10-03-2007, 03:18 PM
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Car: 85 camaro z28
Engine: 305 TPI
Transmission: T56 6 speed
Axle/Gears: 3.27 borg warner 9 bolt
9 bolt or 10 bolt?
what exactly is better about either or? is one more powerful i heard the 9 bolts have a better posi unit in them that uses a cone type clutch, no clue what that means if someone could explain.
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Old 10-04-2007, 12:49 AM
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Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
Re: 9 bolt or 10 bolt?
A 9-bolt has a 7.75" ring gear, and a 10-bolt has a 7.5" ring gear in the early 80's and later they switched to a 7.625" ring gear. I think that happened around '85. A 9-bolt is marginally stronger but parts are hard to find.
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