^ what he said. Be carefull with hilux rear ends as its easy to fall into a trap and get the wrong series. ie if you get an E series 7.1" diff you'll never ever find an LSD. F series 7.5" is the one you want. But the LSD's are pretty basic.
Thats why I went for a mazda rx3 lsd and econovan housing. the econovan housing has one long and 1 short axle, so we shortened the side with the long axle, found another lshort axle and hey presto.... The advantage is if i blow an axle a standard econovan one from the short side will fit, without having to shorten the axle itself... if ya know what i mean...
or win lotto and go for ae86 stuff...