Tavi
Vehicle enthusiasts
Hello everyone, if I may start out with a question, my four wheel drive 98 GMC when it was new, a fleet truck I think, it had a 3.42 ratio and a positraction axle. The RPO codes showed,
GU6 : AXLE REAR, 3.42 RATIO
G80 : AXLE POSITRACTION, LIMITED SLIP
I suspect that has long time lost that ability as I can 'light up' tire on payment quite easily if I try. What I'd like to know is, has anyone fixed it so it works again like it was from the factory or went with some other type of locking set up?
I don't know what size the rear end is, sorry.
Every once and again, very rare but I've heard of it happening they will die gracefully, locking components will drop to the bottom of the diff and it will be rendered an open diff. Other more likely scenario, PO blew up the rear and replaced it with an open diff.
The down and dirty description of the G80 gov-bomb, it is essentially an open diff. When one wheel spins faster (100 rpm). The centrifugal force causes a wedge to jam itself between the spider gears.
So the literal design that some genius' came up with was, when s**t starts turning really fast, throw a monkey wrench in there to make it stop.
Last edited: