9 bolt gear oil
Thread Starter
Supreme Member
Joined: Aug 2003
Posts: 1,644
Likes: 4
From: Long Island New York
Car: 89 Formula 350
Engine: Forged 385 H/C/I
Transmission: 700R4-4300 Stall-lockup
Axle/Gears: BW 9 Bolt 3:70
9 bolt gear oil
I did a search and I see the BW 9 bolt does not get the posi additive. I also found the GM part number for the gear oil 1050010. I haven't found that part number being sold, but did see a post stating that that GM has since changed the part number to 89021671? Anyone have any info on the correct part number for the BW 9 bolt...Thanks
Joined: Sep 2005
Posts: 27,996
Likes: 2,485
Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Re: 9 bolt gear oil
Just go to the store and get some gear oil. You don't need to get it from GM. Not something to outsmart yourself over. 
Personally I prefer Mobil 1.
Personally I prefer Mobil 1.
Thread Starter
Supreme Member
Joined: Aug 2003
Posts: 1,644
Likes: 4
From: Long Island New York
Car: 89 Formula 350
Engine: Forged 385 H/C/I
Transmission: 700R4-4300 Stall-lockup
Axle/Gears: BW 9 Bolt 3:70
Supreme Member
Joined: May 2005
Posts: 1,058
Likes: 4
From: Malvern, Arkansas
Car: 90 IROC 2-92 Zs blk vert & prpl
Engine: stealth ram brodix track 1 ful port
Transmission: 700r4 4l80e
Axle/Gears: iroc 375 lokr 92 Z 277 pos vert 327
Re: 9 bolt gear oil
I use mobil one in the rear, the motor (including filter), and the trans. I even use it in my lawn mower.
Joined: Nov 1999
Posts: 1,790
Likes: 22
From: Monroe,NC
Car: 90 Formula
Engine: 305
Transmission: 700R4
Axle/Gears: 9 bolt/3.27
Re: 9 bolt gear oil
The GM Firebird service manual states to use the additive. This is stated in both the section on 10 bolt and the section on the 9 bolt.
Thread Starter
Supreme Member
Joined: Aug 2003
Posts: 1,644
Likes: 4
From: Long Island New York
Car: 89 Formula 350
Engine: Forged 385 H/C/I
Transmission: 700R4-4300 Stall-lockup
Axle/Gears: BW 9 Bolt 3:70
Re: 9 bolt gear oil
Supreme Member
iTrader: (3)
Joined: Sep 2003
Posts: 6,859
Likes: 14
From: Cypress, California
Car: 1989 GTA
Engine: 369 TPI
Transmission: 4L60E
Axle/Gears: 3.70 Nine Bolt
Re: 9 bolt gear oil
I have been running Mobil One 75W-90 in mine for quite awhile. No problems.
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Senior Member
Joined: Apr 2006
Posts: 836
Likes: 0
From: Pgh PA
Car: 89 5.7 IROC/95 LT1 Corvette
Engine: All 5.7's
Transmission: 700R4 (Roessler)/ZF6
Axle/Gears: 10 bolt Zexel 3.23's. CTW 17" wheel
Joined: Dec 1999
Posts: 3,544
Likes: 19
From: WI,USA
Car: 89 FORMULA 350, 91 Z28 Convertible
Engine: ls1, LB9
Transmission: t56, Auto
Axle/Gears: S60/ 3.73
Re: 9 bolt gear oil
regular gear oil is fine. it uses cones (metal on metal to give you anti slip). there is no clutch material so no need to use friction modifiers. if you think you need to use the additive you can it wont hurt it but its not "needed"
synthetic is ok too.
synthetic is ok too.
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