Hi gmacrae
The standard diff that is in the ls400 is an open center, not a torson (was a very limited option in ls400) and is mount to the subframe via 3 point location, this is a 4 point location torson diff that i have an is in very good condition (ratio 3.9:1), it came out off a 97 6speed supra that had done only 50k on it. Before installing it in the car, we did check the diff out and all was very good, NO play and was very tight an we had to modify the subframe to fit it. I was going to go for a 2 way KAAZ diff center in it, but it would be a bit too full on for the street and in the wet with the expected power im looking at, OK if your wanted too drift it.