I'm trying to get some info on the 9 bolt.From what I've read so far they seem to be an ideal upgrade over a 10 bolt.Anybody got any idea of what sort of horsepower can be put through one,what brakes they use,upgrades,compatibility etc.They seem to be a lot cheaper than a 9"(providing I can get one in the UK) and don't seem to have modification problems my friend had with a supposedly "bolt on" 9".Thanks

 

Cut and pasted from this website: http://www.f-body.org/tech/tech.htm

Also found on this site: https://www.thirdgen.org/newdesign/tech/techdb.shtml


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.

 

The 9 bolt is somewhat stronger than the 7.5 inch 10 bolts But.......big but. Apparently no body supports these. As far as i know the only other ratio ( from stock ) available is a 3.70. I think slp sells it its 300 dollars. you would be better off with a 10 bolt and aftermarket internals or in the long term just bite the bullet and get a moser 12 bolt or a 9inch. If your going anything near fast it will break eventually, the 9inch or 12 bolt will last in the most severe application

 

These are strong units, but there is a short list of suppliers.

Check here for 9-bolt info and part availability. My guess is that this stuff can be shipped to the UK...

http://www.diffsolutions.com/

Good luck.

 

nice

thanks

 

www.9bolt.com

 

Hey Eric, good to see more UK users on the board! I was looking for a axle for mine as I had 2.77 gears and drum brakes on the rear. I placed an ad in Classic American and got a call. I went to see this rear axle (in Essex) and blow me if it wasn't a Borg Warner POSI with Discs off a car that had only done 27,000 miles It cost me £250. I thought that was a result. From what I've heard you can run slicks with 9 bolts and not have to worry (certainly until you get past 400bhp- then it's 9" time!)

See you around!