Ratios as you say, no difflock (can be a PITA if you want to winch someone else, or park on a slippery slope) but run quieter and much better handling on the road, at the limit of grip the car will go very slightly into oversteer (like an early S1) but very rarely understeers.
Interchangeable at least externally with the LT230, bolts up to LT77 and R380 plus the B-W auto box, all the same fitting.
FILL WITH ATF.