Just got a ram 2001 5.9 4x4 gasser a week ago and have been working on it none stop since previous owner never really took care of it... after doing a lot of engine work and body work Im looking at upgrading the rear axle to a minimum slip diff... I have a stock 1 wheel wonder diff in now but I was wondering if anyone has upgraded theirs. Im going to use this for plowing and would like to have both rears moving. Has anyone done an upgrade? Do they sell kits? How much would it cost? pros. cons. ? Thanks!