Hello Dieselboy, i have a terrano td2t too, and i swap the r180 to r200, and i replace the original 4.625, to 5,14 gears, i run with 285/75r16 perfectly. The swap is very easy, but you need change the all the drive shaft, and the hub, because, your original drive have 6 bolts, and the r200 5 bolts, and the axle of the r180 carry 27 splines, to 28 for the r200 axle, the knuckle spindle is not the same too .The crossmember to the r180 is good for the r200. Just one more thing, you need, raise a little the engine, because the oil pan is touch with the differential. Ah!, i have a front lsd and lockright locker in the rear.Excuse me for my english, but the translator isn't very good.