Have acquired two disc brake rearends while the site was down. One, a 9 bolt posi unit, I have found is hard to find gears for. The other, a ten bolt posi unit, i plan to put under mu '84 Z28 this week. Removed inspection cover to verify gear ratio. Can't find the "refill" hole i'm accustomed to using to add gear oil. Do I have to refill before I reinstall the cover? How do I know how much gear oil to add? Anybody need a 9 bolt unit?

 

The fill hole on a 10 bolt is a plug on the right side of the case. Fill to the level of the hole. It takes about 2 Liters/quarts. I just yanked out my 9 bolt in favour of a beefed up 10 bolt. The 9 bolt was surviving my drag racing but the 3.27 gears sucked and 3.70 wasn't enough.

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Stephen's racing page

87 IROC-Z Pro ET Bracket Race Car and knocking on the SuperPro ET class
383 stroker (carbed) with double hump cast iron heads and pump gas
Best ET on a time slip: 11.857
Best corrected ET: 11.163
Best MPH on a time slip: 117.87
Best corrected MPH: 126.10
Best 60 foot: 1.662

Racing at 3500 feet elevation but most race days it's over 5000 feet density altitude!

Member of the Calgary Drag Racing Association

 

Hey, RussMan... If you're looking to ditch that 9-bolt, let me know. What gears, etc. does it have in it?

I may be interested in that axle, if the costs aren't too high. Might even drive down to get it...

 

Russman, that 10-bolt sounds like the 1984 3.73/posi/disc axle I just put under my 2.8 Firebird! The brakes were a pain- I got a bad rebuilt master cylinder.

-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards

 

Found the "refill." Right where it was supposed to be. 9-bolt is out of an '86 T/A. 2.77 gears. Posi. Planning to advertise in the paper for $200 or so. Let me know if you're interested.