What are the different stock rear diffs? my dad is getting one of these cars (tomorrow in fact). its a 280Z, not sure on the year.

Is there any way I can tell what the diff is?

http://www.geocities.com/inlinestroker/ratio.html

Of course, you never know what a previous owner may have installed......

I'm pretty sure it's stock. So, since I know it's a 280Z 5 speed, it's got an R200? Did those come with LSD?

The first Z that came from the factory with a LSD wasn't until 1987. If yours has one, it would have had to have been put in as an add on. Nismo still offers them although they are pricey(700+) and becoming harder to find for the R-200's and R-180's.

Quaiffe has one that fits, and is similar to the Torson units, but they are usually 900+ dollars.

Alright, coo.. (now I gotta see if a mk2 supra LSD will fit )