axlrose

I have a 2000 WS6. I'm going to change the diff oil soon. Couple of questions

1) How do I know what kind of diff I have? Auburn, Eaton, Torsen(I think those are what they put in them).

2) After the cover has been taken off, is it a good idea to clean the inside of the differential with break cleaner or something similar?

FirstYrLS1Z

iTrader: (4)

1998 and earlier-Auburn
1999 and later-Torsen

just wipe the bottom out thoroughly,don't take a chance of screwing something up by washing out with a harsh non-lubricant.
clean off the magnet that's on the inside of the cover,don't be alarmed that it looks really 'bad',it's doing its' job by removing from the fluid any iron/steel particles.

axlrose

So correct me if I'm wrong then, the Torsen diff doesn't use clutches like the True-trac ones? I thought that was one of peoples main points when complaining about these rears?

Torsens take Synthetic Oil correct? And you "can" add the GM additive to keep them quiet?

Also I assume I will need a new gasket? Or it RTV better?

joecar

Yes, both Torsen and Truetrac are all gear.

GM service manual specs synthetic gear lube.

Additive can be added but it won't effect noise/quiet (most synthetic gear lube name-brands already contain LS additive).

New gasket from GM (these are thicker than the Felpro ones).

therabidweasel

iTrader: (5)

My vote is rtv, I use blue permetex, never leaks, cheap and available. Not sure about ws6, but auburn was an option on the SS...and you need nonsynthetic and additive for auburns.

mezzyshreder

What do I use to change the gear fluid in an 02 t/a with the 3:42 set up? I believe it should be synthetic but im not sure. Should I go with GM fluid?

joecar

2001/2002 have the torsen differential, for this GM specs synthetic gear lube, use any that you can buy at your parts store (e.g. Mobil-1 75W-90), it is cheaper and better than GM's.