If i'm wrong, some1 please correct me. I'm also new at the t-18 info, but this is what i've learnt.
As far as i know..... All T-18's only use early model LSD's (ZENKI).
And from what i've seen the differance between an early model t-18 and a late model is late models are more likely to have sway bar mounts (like mine )
If you get an early model ur gonna hav to cut the swaybar mounts off ur stock 86 rear axle and welded em on to the t-18 axle.
Also some early model t-18 centres can hav shit ratios like 3:9.... you should get 4:1. Or acceleration will suffer.