Nah.. just a black grimey one which Im replacing with another black grimey one. Incidentally the diff going into the car is also oily inside... so I certainly hope this is OK.
Are you just going to take his word for it then? What if Wantsom is not correct (just playing devils advocate here) You might want to get a second opinion. Ask a woman, they seem to know everything?
I would say yes. Looking at the manual, the differential case assembly bolts to the crownwheel. Swap it out and bolt in the LSD one. Obviously double check before buying things on my say so.
Do you know whether the inside should be oily or not?
Cookie, does it affect performance if you paint the diff another colour?
Cam sounds credible to me. And his logic seems pretty sound. You got any other oil in the car Cookie. Could be a lot of unnecessary weight you're carting around.
My JB has a 3.9 open diff, and appears to be factory. The 3.9 has its uppoints, e.g. you can take off in 2nd very easily without stalling, acceleration is increased of course, according to my car you lose 30KPH top speed, unless you have a DASH motor.
1997 Mitsubishi Lancer Evolution IV 4G63BT
1996 Nissan Maxima VQ30DE (for sale, suit someone who likes the feel of boats when driving)