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Old 12-28-2005, 11:07 AM
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1968 Firebird

I want to put a disc brake Posi rear end into my 1968 firebird..

has anyone out there done this?? which rear ends are compatible ("Bolt on")..

thanks..

Dave

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Old 12-28-2005, 11:46 AM
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You could order one from Currie, Strange, or Moser, but that's big bucks. I would suggest buying a posi to put in, and doing a junkyard search for rear discs. 80's caddys sometimes had rear disc options that will fit. Any of the late model Caprice, Fleetwood, Roadmaster, Cop cars, Impala SS, Firebird, T/A, Camaro, ZR2 s-series trucks, etc had optional or standard rear discs on a 10-bolt that you can scoop up and bolt on to your axle.

Basically any 10-bolt axle will accept disc brakes from any 10-bolt axle; 7.5, 7.625, 8.2, 8.5... all should work fine. The F-body rear discs will be more expensive if the junkyard knows what they are, but they will get you the proper 5x4.75 bolt pattern for your car.

As far as I know, there is no direct junkyard bolt in that gets you what you want. There are some that would fit with minor or major mods, but by the time F-bodies had switched to a rear disc option, it was wider and a completely different suspension setup from yours that is very difficult to adapt. You're probably best to either buy a first-gen F-body rear with a posi and then find rear discs from a later 10-bolt, or install a posi and junkyard discs on your axle.
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Old 12-28-2005, 12:47 PM
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Thanks Curtis73...

i still need to identify exactly which rear end i have in the car...

I have a sneaky suspicion that it is not the original..

i was told that the Pontiac rear ends had indentations "scallops" on bothh sides of the diff. cover. mine does not have these.. what i do know is that it is 10 bold GM and has one cooling rib on each side..
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Old 01-03-2006, 02:09 AM
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I thought they had a rear disc option in '69.

Here's some ID info: http://www.oldsmobility.com/10bolt-tech.htm
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