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Question about 4th gen rear

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Old 10-21-2006, 11:37 PM
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Car: 1987 Pontiac Trans Am
Engine: 350 Vortec
Transmission: 700R4
Axle/Gears: 3.42
Question about 4th gen rear
Out of what 4th gen car would have the 3.73 posi rear end?
Is 3.23 gears good?
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Old 10-22-2006, 06:17 AM
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Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Originally Posted by 85T/A350
Is 3.23 gears good?
Personally, I wouldn't want anything below 3.23's, which is what I run.

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Old 10-23-2006, 06:53 AM
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As far as I know, none of the 4th gen cars got 3.73's. The lowest gear they got was 3.42.
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Old 10-23-2006, 07:14 AM
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None, not a stock gear ratio on any 4th gen rear axle.
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Old 10-23-2006, 02:39 PM
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Car: 89 Iroc-z
Engine: 555 BBC Turbo
Transmission: TH400
Axle/Gears: Strange 12 bolt 3.42
https://www.thirdgen.org/forums/tran...-gen-rear.html

rear end info.... only manual cars got 3.42s and none higher. if you want 3.73 your gonna have to buy some
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