im a diehard nissan junky, and have a stack of different R200s. my recommendation is to use the Q45 R200 rear diff, and get a skyline GTR aftermarket LSD for it. this would bolt up to the inline pro kit, but you will need driveshaft shop to use the skylinegtr/q45/300zx TT inner joint w/ 6 bolt circle

more info here:

http://www.club240.com/forums/showthread.php?p=328500

 

I've got my r200 diff with approximately 20k miles on it off a 95 300zx that had been sitting for 10 yrs after a wreck. All I did was change out the fluid and I haven't had any problems with the viscous lsd. It seems to lock up very well although I'd reall like to get the Quaiffe but its very pricey and there is some machining that has to be done to get it to fit in the case. I think Carey knows about this from when Steve had the car and put it in. Ill stick with the stock viscous until I start having problems out of it.

 

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