Hey, i was absolutly gutted to find my brothers hilux had a factory lsd in his truck

, thing is i dont think it works as well as it should, ie i was doing some doughnuts in my safari with an lsd, good times, but he tried in his hilux and could only get the inside wheel spinning??
these should be solid diffs aye?? what sort of oil is supposed to go in these, its a `98 hilux, nz assembled, last of the soild fronts.
cheers guys