GTST or GTR LSD. GTST is just a viscous diff, fine for on the cheap, chuck a couple of shims in and it'll do ok. GTR diffs are clutch type Mechanical 1.5 ways. If you were to chuck a set of Nismo clutches(Which are just the stock clutches/sring discs in a different pattern and cheaper than buying the parts direct from Nissan) Then it'll lock up pretty nicely. Just rebuilt one for a mate of mine and it's now very predictable and very easy to control.
Going to an aftermarket 2 way would be the best option for a drift setup but will cost a lot more.
Why would you replace your axles to run a welded diff? Like for like they're exactly the same. If you have a GTR diff and GTR shafts then you'l also have GTR hubs which have a thicker splined section for the outer CV so slightly stronger but still not much different.
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