possible 87 z28 rear ratios
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Joined: Apr 2002
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From: New Jersey
Car: 86 Corvette, 89 IROC, 1999 TA
Engine: 350, 350, LS1
Transmission: 700r4, 700r4, T-56
Axle/Gears: 3.07, 373, 4.10
possible 87 z28 rear ratios
what are the possible factory rear gear ratios for a 87 posi from a z
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89RS,
With an '87 Z-28, the statisics indicate that there is a high probablility the car has a borg Warner axle. The common ratios offered with those were 2.77:1, 3.27:1, and 3.45:1. If the axle center housing rear cover has nine bolts, it's an Austrailian Borg axle (lucky you!).
If the cover has ten bolts, it's a Saginaw axle (not quire as lucky you). Saginaw produced 2.73:1, 3.08:1, 3.23:1, and 3.42:1 axles for that year.
Our own beloved site reference ( https://www.thirdgen.org/newdesign/tech/techdb.shtml ) missed the fact that many WS6 cars came with the 2.77 Borg axle.
With an '87 Z-28, the statisics indicate that there is a high probablility the car has a borg Warner axle. The common ratios offered with those were 2.77:1, 3.27:1, and 3.45:1. If the axle center housing rear cover has nine bolts, it's an Austrailian Borg axle (lucky you!).
If the cover has ten bolts, it's a Saginaw axle (not quire as lucky you). Saginaw produced 2.73:1, 3.08:1, 3.23:1, and 3.42:1 axles for that year.
Our own beloved site reference ( https://www.thirdgen.org/newdesign/tech/techdb.shtml ) missed the fact that many WS6 cars came with the 2.77 Borg axle.
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