Posi for an \'87 What seems to be the best posi to install in an '87 K-5? It has a factory posi that can still spin both tires, but the case is cracked. This truck is stock all the way down to the 31's and is my dads daily driver. I have used Auburn in my old GN and my buddies 93 K-1500 without problems. No $$ for upgrades to a 12 or 14 bolt Dave Hiller 90 K-5 "The Anti-SUV"