Got my engine running well, just put new tires on it and it is sitting well (89 YJ 4.2L, 30x9.5 r15), now I want to lock my diffs. I've got the stock d35 rear and d30 front. I don't do anything too hardcore off road (it is still my daily driver) but I would like a little more traction. I am debating between the detroit ez locker and the powertrax lock right. Has anyone ever used either of these? How necessary is a locker anyway? should I just save up and get a full-blown ARB air locker($$$$)?