I recently got a 9 bolt rear with disc brakes and some sot of posi. I cant find any aftermarket covers for it. Does anybody know where to get one from? Also, can antone tell me how to find out what kind/size gears are in it? There are only some numbers stamped on the crown gear (none of witch are ratio #'s). I cant read the pinion gear. The posi casing has "Austraila" stamped on it and so do the outer baring covers. Any help is grate. Thanks. Oh, if anyone wants the # that are stamped, just let me know. Thanks.

 

I also have the Australian 9-bolt. I havent seen anything relating to these rears except gears(which are very expensive, at least the ones I've found).Mine ratio is 3.27 in an 89 Formula (RPO G80).Good luck with the cover. I'll be watching the post see if anyone else knows.Mine is a limited slip with 4wheel discs.

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89 formula 350, 73000k, 9-bolt 3.73, gutted MAF,dynomax muffler,gutted air box,kn,accel coil wires,dunlop 60/235
g-tech best(9 runs)14.48@101.1 0-60=5.91
track best(3 runs muncie,in 88 degrees)14.51@96.0 60' 2.089
in the garage waiting to go in are alum. L98 heads(porting by scoggins-dickey),ported high-flo edelbrock base,slp runners,zz4 cam 209/221 .474/510,1LE alum. driveshaft,TCI 2200 stall,LPE feul reg.,TPIS air foil,

[This message has been edited by L98FORM89 (edited March 31, 2001).]

 

check your axle code for gear. should be either

2.77/3.08 (usually auto w/ 305 or 350 with single cat car)

3.27 (usually auto w/ 305 or 350 with dual car car)

3.45 (should be stick and 305 only)

3.70 only aftermarket gear available

 

Been looking for a cover for years never found one. I wonder why? I will be checking to see if anyone else has.

 

When I bought my 9-bolt I did an extensive search for gears, posi replacements, and covers with little to no luck. These rears don't brake, but I'll be screwed if it does... No cover found for the 9-bolt.

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1984 z28 w/ a 357 cu in. monster engine which is looking like the posterchild for Edelbrock with the exception of the Holley 750vac... all the suspension stuff... 9-bolt posi disk is in...

-=ICON Motorsports=-

 

Are these rear ends different from the borg warner 9 bolt? If not you can get gears for them as long as they are the 3:73 kind. You can get these from precision gear.

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89 Iroc 350 TPI,
Forged pistions
Comp Cam .510 lift 230dur
Flowmaster exhaust
Aluminum Heads SOON!!!
MINI RAM SOON!!!!!
stock TPI for now 24# inj

[This message has been edited by AaronIROCZ (edited April 05, 2001).]

 

Same rears... and it is the 3.70 gear. 3.73 is for the 10-bolt. The gears are also more $$$ from the few places you can find them.

 

Search the tranny/drivetrain forum, I've posted on this topic numerous times. However nobody has found a replacement cover, only stock.


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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
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-