1) Don't know, maybe Getrag in Germany can tell you. Its a V160 or V161 gearbox depending on ratios. 2) Yes, but lots of work 3) It's hydraulic and mounted on the bell-housing
There are manual kits for the 1uzfe, try Hadfields or the Castlemaine Rod Shop, but it wont be cheap!!! The box alone is worth more than my wifes car.
If anyones interested, here are the ratios v161 v160 1 3.724 3.827 2 2.246 2.360 3 1.541 1.685 4 1.205 1.312 5 1.000 1.000 6 0.818 0.793