Well I got the bad news today. Rear tires were locking up when going around turns. We thought it might be the posi, but the carrier is busted. The mechanic said I have to replace it with another posi. Is that true? I was just gonna get a rear from a junkyard cause I have to sell it. But he said I'd have trouble finding a 3.42 posi in a junkyard. $600 for parts from GM, easier and cheaper to throw in an old rear. What do you think?