Will 4th gen gears work in a 1988 10 bolt?
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From: New Smyrna Beach, FL
Car: 1988 GTA
Engine: 305
Transmission: 5 Speed
Will 4th gen gears work in a 1988 10 bolt?
I am getting a zexel posi unit from an ls1 that has 3.42's on it. Can I use these gears or do I need to put my old gears on the new posi unit? Will my old gears even fit on the zexel posi unit?
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From: Florida
Car: 1987 Black IROC-Z (SOLD)
Re: Will 4th gen gears work in a 1988 10 bolt?
Yes, if you have a 3 series carrier and the it will work with LS unit. All 10-bolt gears are 7.500/625 dia for both 3rd & 4th gen cars. On a side note: make sure axle spline is correct with that LS if that is being changed.
Joined: Jul 1999
Posts: 10,950
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From: Orange, SoCal
Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
Re: Will 4th gen gears work in a 1988 10 bolt?
An '88 10-bolt will most likely have 26-spline axles in it, while the 4th gen posi unit will definitely have 28-spline axles. They are not compatible. You'll need to get 28-spline axles for a 90-92 thirdgen 10-bolt as well.
Yes the gears will fit on the posi-unit, but the axles are your bigger problem.
Yes the gears will fit on the posi-unit, but the axles are your bigger problem.
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