disc brake rearends
09-10-2000, 11:04 PM
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disc brake rearends
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? 
09-10-2000, 11:19 PM
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Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
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
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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
09-11-2000, 09:23 AM
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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...
I may be interested in that axle, if the costs aren't too high. Might even drive down to get it...
09-11-2000, 01:11 PM
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Car: 1986 Firebird
Engine: 2.8 V6
Transmission: 700R4
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
-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards
09-11-2000, 10:04 PM
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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.
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