Kyle92GT

Damn I havent been on this board in about a year. The kid who I sold my 86 TA to went to have 3.73's installed the other day by a performance shop that i kinda dont trust. He told the kid that he couldnt replace the gears becuase it was a special 1 of 100 Limited Australian Made rears and that they don't accept aftermarket gears? Ok now the entire time I owned the car and i used this forum I have never heard anything like that. Im doin some research so the kid doesnt get ripped off. The guy is tryin to sell him a 9" rear, which is jsut idiotic, a 305 does not need a 9", just extra weight. So is this bull**** or is it legit? im just lookin out for the kid so mommy doesnt have to spend more of her $$$ on his car.

Kyle

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1992 GT, T5, FRP King Cobra Clutch, MAC Cat Back, Off Road H Pipe, K&N, FRP Aluminum D/S, KYB's, FRP "B" Springs, STEEDA adj. quadrant, 73mm Calipers, FRP 9mm Wires, NITTO 555R's

bjankuski

He is telling the truth. Some high performance Trans Am came with a nine bolt rear end instead of the ten bolt rear end. There are 3.70 gears available for this rear end but there expensive and hard to find, but not impossible to find. Try strange, SLP, TPIS, and national drivetrain.

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1988 Formula 5L/5sp 3.45 gears, SLP cold air kit, MAS gutted, TPIS air foil, TPIS AFPR, MAC headers, Mac under drive pulleys, MAC cat back, Relocated MAT.
Best ET street tires 13.85
Best 60 FT street tires 1.930
Best MPH street tires 99.29

Kyle92GT

wow, ya learn something new everyday. Ill let the kid know.

Kyle

91banditt2

iTrader: (1)

i've heard of these rear ends also.don't know much about them......but i have heard about them

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1991 banditt2 #130 of 600
Project 350 TPI Banditt II
http://www.street-dawg-racing.cityslide.com
http://photos.yahoo.com/tonysams72
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rondubbs

they are the borg warner rears usually found in GTAs.

[This message has been edited by ron rizzotti (edited March 25, 2001).]

Kevin91Z

iTrader: (1)

The Australian 9-bolt axle was available on 85-89 Camaro Z28's and Trans Am's, usually on the 350's but also found on the 305's. You can identify it by it having 9-bolts holding the cover on, hence its name. Its not rare, but aftermarkte support never really caught on. I know of three places that sell 3.70 gears for it.
http://www.drivetrainspecialists.com/
http://www.ring-pinion.com/
http://www.calgear.com/
I've never dealt with any of these companies, I just noticed they list the 3.70 9-bolt gear in their catalogs. I dont know if its possible to get the 3.45 gear anymore. Several Australian members of this board say that rear end is very common there, and is still used in new production cars. You might be able to contact a company in Australia about it, but shipping/handling/etc might be cost prohibitive.
The 9-bolt rear end is stronger than a 10-bolt, as its ring gear is 7.75" in diameter compared to the 10-bolts 7.5" or 7.625". Plus the 9-bolt does not use c-clips, further adding to its strength.

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West Coast GM Shootout 2001!
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
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Fastcamaro87

nobody mentioned that however uncommon this rear is , it is not 1 of 100 made, like he said above.

national drivetrain www.nationaldrivetrain.com
has 3.70 gear sets for $350
and so does strange

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87 IROC-z 305 TPI 5spd Borg warner 9-bolt 3.45 posi 4 wheel disc,8.8 Accel wires , bosch platinum +4 plugs,gutted air box,k&n oil filter,synthetic oil 10w30

87kevroc

From the 'Camaro History' section of the Tech Data section on this site under 1987-

'G92 and L98(B2L) cars finally got the Borg-Warner HD 7.75 inch four pinion rear end, produced by GM Holden's Limited of Australia (Firebird WS6 cars went to this unit in 1986). These units can be identified by their 9 bolt (rather than 10) differential cover that has a rubber plug. The Borg-Warner logo is also cast into the bottom of the differential case. This rear axle came with tapered rather than straight roller bearings and a cone-clutch rather than disc-clutch limited slip unit. These units came painted black from the factory while most others were bare metal'

Kyle92GT

Thanks for all the info fellas. Ill relay the information to him... Maybe I shoulda hung on to that car....
Kyle

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1992 GT, T5, FRP King Cobra Clutch, MAC Cat Back, Off Road H Pipe, K&N, FRP Aluminum D/S, KYB's, FRP "B" Springs, STEEDA adj. quadrant, 73mm Calipers, FRP 9mm Wires, NITTO 555R's