FOund som third gens at the salvage yard with factory disk brakes installed on rear end. If a third gen has rear disks, does it have posi too? How do i tell if it has a posi in it? what do i look for? I know there is a hard to read casting number on the passenger side axel tube. Just wondering..... might head back over there tomorrow and get some new projects. If i get the rear with disk brakes, and the proportioning valve, should the front and rears have the proper brake pressure to operate, or should i still get a wilwood brake proportioning valve?

john

Not necessarily...I've seen many 2.73 open rears with discs. Just have to check the RPO codes or open up the differential and take a look to be sure.

Ed

Disc brakes (J65) & Limited slip (G80) are different RPO items and are Not required options for each other. So you can have one without the other. GM did stange things with options.

ok, now how do i tell what the gear set is in the rear end? count teath?

john

If you have the RPO codes check them for the rear axle retio. Or look at the Tech data on this Site for what came with RS.