From a post on GTR, R33 4.11,and R34 3.565

Most googling seems to back that up.

Not sure about dedicated front 4.11 diffs, but some Nissan 200's will have a rear 4.11, as will some R160 diffed Subarus ( that's the small diff, so may be strong enough in a front application...or may not )
I think the 200's use the R200 diff, which is obviously bigger.