I have a 1984 Z28. Some people have told me its posi, but I think its 1 wheel peel. Idk. It's in the shop right now or I would fire her up and figure this out lol. So does anyone know if it is or isn't? Thanks.

 

From the 10-Bolt FAQ:

Do I Have a Limited Slip (aka Posi) (RPO G80*)?
Jerk the diff cover.** Open/Standard can be seen in the following link: https://www.thirdgen.org/forums/tran...1073-posi.html (posi?)

Gov-loc: https://www.thirdgen.org/forums/tran...rear-diff.html (3rd gen rear diff help!!)

Auburn: https://www.thirdgen.org/forums/tran...ing-axles.html (Tips/Tricks for Installing Axles, Bearings, Seals)

*Apparently, G80 was an extra-cost option which could be special ordered on any rear regardless of ratio.

**The most reliable way to determine if your car is equipped with a limited slip is to look. That said, this from big gear head: With the tires off the ground and the transmission in neutral, you should be able to turn one wheel and the other will follow in the same direction. This is limited slip or "posi". If the wheels turn in opposite directions, it’s a standard/open differential—OR a worn out limited slip.

JamesC

 

Thanks.