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Yes, r32 diff's are r200 casing.
I can't believe that nobody here actually measures their tolerances with a micrometer. If you add too many shimm's you could grenade the diff.
Also, where is everybody getting this 1.5 way stuff from? You will rather have a open diff, VLSD, or a fully locked diff with a little bit of play compared to a welded diff. A true shimmed diff is often considered the two way of a locked diff world...that is to say it is more forgiving than a welded diff, but by no means a clutch type diff as far as daily driving characteristics.
I have had several shimmed diffs now and never had any problems. I use one in my solely dedicated s14 race car. I had it in my old s14 that was a daily driver/weekend drift car too. It can be a bit of a pain in the ass daily driving, but if find that if you physically shift into neutral (not just pushing the clutch in) and coast around a corner, it is 100 times smoother than just trying to drive around a corner with a shimmed diff.
The only problem I have seen with a shimmed diff was the shimm wearing down and the diff stopped locking (only spun one wheel). To me, this is much better than having a welded diff go bad, because you can still drive home!
Remember, people have been shimming diffs in Japan for a LONG time. People don't weld diffs over here very often (as welding is a bit more pricey) and probably because shimmed diffs are safer/reliable. In fact, the only people that I know who run a welded diff are some D1 drivers.
I hope my input helps answer some of the questions and doubts that I have read in this old thread.
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