ignore all the other twats here, it's an age old argument with stealthy on one side and lots on the other. you want a minispool to suit a 28spline BW 78 diff. should be around the $80-100 and if your half competent with spinning a spanner it should take a couple hrs to install.
if you haven't previously driven a spool before or an LSD ( in good condition) i suggest you take it to a "private"
car park or maybe a paddock somewhere and go have a play so that you get use to how it handles.
take it easy in the wet and have fun.
now for the disclaimer part.... spools are illegal. you can get defected for it and if you do stack it one day and the insurance company finds out they will use it as an excuse not to pay out on the claim. that covers the legal stuff
let us know how you get on:whistling