did anyone rebuild a 9 bolt posi unit? I have an 89 formula with the ausi rear, and the posi is completely open. my fault I never changed the gear oil, but i hear they all loss their posi action anyway. I auto-x and I need posi badly to catch those pesky 4th gens I'm willing to buy another posi unit from GM, but I hear they don't last that long. has anyone done this? I want to keep the 9bolt as it is OE, and big disk brakes that work. any suggestions besides finding a ten bolt. the gears are nice too, 3:45 (or 3:42 I forget now)

 

Larry, the good news it that the posi can be rebuilt. I have e-mailed you info that was sent to me by Karl Hunter on how to service your 9-bolt. Contact him if you have any further questions. Good luck, Lon.

 

I have a 1987 GTA with the 9 bolt 3.45 rear end. I ordered new bearings and 3.73 from reider racing. They seem to be one of the only companies with parts for these rear ends. 1-800-356-1330. i'm sure they can help, also try searching the archives on this page for old postings about it.

 

Strange Engineering is Cheapest...

I called EVERYWHERE.

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"Doin 120 Mowin' over mail boxes, radar detector, to show me where the cops is."

"Ain't no such thing as a front wheel drive sports car...I can smoke the tires in my 1985 Accord with 87hp (factory rated)."

1987 IROC-Z28 Camaro
-ADS Super Chip-Replaced all fluids with Red Line Racing Synthetic fluids-Griffen "Nascar" Aluminum Racing Radiator-Good Year Super Hi-Miler Cooling Hoses-160 Degree Thermostat-Jet Fan Switch- Center Force Dual Friction Clutch-Hays Flywheel-New Alternator-Polyurethane transmission mount-Doors sound insulated with Dynomat Super-Replaced Ratted Hoodliner with new one from GM-Accel 300+ Spark Plug Race Wire with Pro-Sleeve -Bosc Platinum +4 Spark Plugs-305 H.O. Dual snorkel intake-Four Dunlop SP Sport 9000 tires (245/50ZR16)-New 3.70 gears in a Posi Rear End off 89' Trans-Am (Sandblasted and Painted Black with Yellow rear end cover)-Rear Disc Brakes (11.65 inch rotors with PBR Aluminum Calipers off 89' Trans Am)-Polyurethane bushings on rear sway bar-Catco free flowing high performance catalytic converter-Hooker Super Competition 3" Mandrel Bent Cat back exhaust-Replaced cardboard headliner with a waterproofed fiber glass headliner....much more comin' soon. =)

 

Reider Racing only has bearings and such. no posi units or posi rebuilding parts.

 

I hope you meant 3.70's, because 3.73 is a ten-bolt ratio. 3.23, 3.42, and 3.73 are 10-bolt, while 3.27, 3.45, and 3.70 are 9-bolt.

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1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
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