LOL AZ I didn't see you post from yesterday just above mine until just now
Well if the Z32 diff he's looking at is from a non turbo and its got axles with it then its just as good as a J30, better actually cause its got the same final drive ratio as the S13. The 180sx diff would be even better than that because its got the 6 bolt outputs anyway so he wouldn't need the axles. Either one (Z32 NA or 180sx) is going to have the exact same R200V viscous limited slip unit inside the case.