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I have an 1989 3.9 R200 long nose. I need a good reliable LSD and I want CV's if possible. I bought an OS Giken NS046-HA LSD for a short nose R200. It is for a 1991 240SX open diff. I have used this diff numerous times in SX cars up to 450whp with good results so I wanted to see if it would go in a long nose. I put on new carrier bearings and used the original shims in the same locations. The ring gear bolts are smaller than the holes in the LSD but it is hubcentric so I just bolted it on. I have done this on SX diffs numerous times with no issues. There are spacers available if this worries you. The backlash and preload were within specs. First thing I noticed was the thick spacer is on opposite sides in the 2 diffs. This had me worried since the stub shafts are interchangeable between the 3 (280Z, 240SX, Z31ZXT). I tried these stub shafts in all 3 diffs. The groove is slightly wider on the SX stubs so I widened the groove on the Z31 shafts. They worked and locked in either way but the Z31's were very hard to get back out and a wider groove with slightly rounded edges matched the SX grooves better. I bought the Z31 axle shafts and flanges from Checkered Flag Joe. They are very beefy. It was no big deal to change shafts. Pull the c clip on the outboard end. Knock the inboard end off by hitting on the race. Change shafts and put it back together. The flanges are much heavier than stock and a tighter fit on the stock 280Z stub axles but went on with minimum fuss. The Giken's are very good and tunable diffs. They drive like stock, with no chattering, on the street but hook up great. They have 20 or so discs. Actually the steels and clutches are all steels but it works. I use Redline NS oil in them for the first 300 miles and then change to Giken fluid. It is very spendy. I couldn't find if this would work or not so thought I would share my experience. It works. Be sure to use an aftermarket LSD for an open diff SX and any one should work in a log nose R200 with either Z stubs or Z31 axles.