a buddy of mine picked this up for a song, but we cant figure out what it is out of. any ideas?

thanks all    sb

R200 Finned Differential. 

Would he like to sell it? (for a song)

I spent some time in a wrecking yard pulling a diff with a finned cover from a 240SX.  Opened it up and it was a welded open diff.  The cover was for looks.  Many viscous LSD's come with finned covers, I believe.  You have to remove it to know what's in there.

I spent some time in a wrecking yard pulling a diff with a finned cover from a 240SX.  Opened it up and it was a welded open diff.  The cover was for looks.  Many viscous LSD's come with finned covers, I believe.  You have to remove it to know what's in there.

Yeah I drove one of those 240sx with a welded diff, the owner really wanted to get rid of it. I was testing it around the Oakland airport loop and it's felt really sketchy, due to that locked diff.

240sx seem like a pretty nice chassis, it's a shame people just trash them as "drift" cars.

Open it up and see if it is an LSD or not. It also might have a small metal tag on it calling that out...

I'd wager to say it's an CLSD from a 300zxt. Open it up and check the ratio if it's 3.7 and looks like this it likely is: