On dry pavement my rear end has been sliding out from behind me like its fish tailing. Is my diff bad?

 

No You have a lead foot! LOL

 

You'll get used to it..........

 

No it happens even more at low speeds and on slight turns...

 

Take the helium out of the tires put chains on and watch out for black ice~!

 

If your tires are going bald, its gonna happen, especially with all that cummins torque. Go Cummins.........

 

I think my spider gear was locking up. I replaced the diff fluid and it was not as dark as molasses but it was getting there. Changed it out and everything is fine now. I did check my tires and they are getting worn but still have a good amount of tread on them.