Steve R

What are all the aftermarket or GM gears available for the Borg-Warner 9-bolt?

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1980 Camaro, '88 Police 350 engine, Headers, full exhaust, completely redone, my baby!
1988 Iroc-Z L98, MSD 6a, Accel coil, K+N's, Airfoil, Coolant Bypass, Flowmaster, Gears, Late model Bose, I like the 80 better

Kevin91Z

iTrader: (1)

GM 9-bolts came with 2.77, 3.27, 3.45, and I've heard 3.70 but I've never seen one.

Aftermarket companies only sell 3.70, and they will only fit cars that came with 3.27 and 3.45, they will not fit 2.77.

www.ring-pinion.com
www.drivetrainspecialties.com
www.calgear.com


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IROCeastTN

So whats a guy, who happens to have a 2.77 BW, to do if I want lower gears?

86TpiTransAm

I feel for ya man, I have the 2.77 gears in mine too!! You can actually get gears that WILL fit but you have to get them from GM directly and they are VERY expensive! Call and check it out sometime!! The only other option you have, which is the one I will probably go with, is to find a 10 bolt rear out of another thirdgen and swap it in!! But if you're like me, you have the rear disc brakes and finding a 10-bolt rear with disc brakes is going to be difficult task!!

Actually in 1985 the borg warner 9 bolt rear ends came with 3.08, 3.27, 3.42, 3.45, 3.70, 3.73, and 3.75 gears!

In 1986 the 2.77's were introduced and the 3.08, 3.42, 3.73, and 3.75 gears were eliminated from the borg warner rears leaving just the 2.77, 3.27, 3.45, and 3.70 rears!!

[This message has been edited by 86TpiTransAm (edited February 27, 2001).]

[This message has been edited by 86TpiTransAm (edited February 28, 2001).]

89ProchargedROC

actually kevin forgot to mention that GM also produced 3.08 gears for the 9 bolt. if some of you have 2.77 gears.....we have some used posis that are in good conditions laying around my shop i could sell you. then you get your 3 series gear

Kevin91Z

iTrader: (1)

I dont mention the 85 ratios because they are so rare. Most people have the 86-89 versions, which have the ratios I stated.

ausrs

actually they also make a 4.11 ratio for the 9 bolt