8 3/4 sure grip not locking

[Paul G]

On the street the diff will lock and leave two equal length burn out stripes every time. When I was doing the burn outs in the water box at lvms the right tire would spin every time, occasionally they would both spin. I believe it is the cone type diff since the springs are clearly visable.

[Ghoste]

If its original equipment my guess is that it's just plain worn out.

[firefighter3931]

If its original equipment my guess is that it's just plain worn out.

The cone SG units wear out...eventually the cone bottoms out and the unit becomes ineffective. The rebuildable clutch style SG units are the way to go when replacing


Ron

[ACUDANUT]

I have been burned too many times on a so called "posi". The pumpkin may spin both axles, with the tires off the ground. However, when you add 3500 lbs. on it and hit the gas, it's a different story and I hate that skunk juice.
They do in deed wear out.  New ones from Randy's are what 1500 bucks now ?  Crazy.