OK I'm fairly new to this mechanical knowledge thing but learning fast. I've got an R33 S2 GTS-T that had a few mods done in Rice land (HKS fmic, cusco suspension, pod, 3 1/2" Blitz Nur Spec cat back). The compliancer also told me it had an aftermarket diff. From talking to a few people it seems to have a locker in it. When turning slow at full lock I can feel a fairly gentle clicking/gripping throught the steering wheel and the tyres slip a bit against each other - hence a locker? The outside casing is stamped 351 which I believe is a pretty standard general driving gear set-up. Thing is I don't know that I really want the locker - not going for full on drag racing stuff, and would rather a standard LSD for driveability and to save my tyres. To go the LSD option do I need to replace the whole diff or just some of the internals as someone told me. What's the locker set up worth and what would a standard LSD set me back. I know the only real way to check is probably pull it all apart but I'm not too interested in doing that, but if anyone can give me a bit more info I'd appreciate it.