[gmac310]

I have this same problem too, only mine does it after traveling at highway speeds for an extended period (say 1/2 an hour or so). At first I thoguht it was the road surface but then noticed that it does it at other time and it also only does it when I turn the wheel and give it gas. I'm gonna change the diff. fluid this weekend and see what that does. Definately unnerving to say the least! BTW, I have replaced the u-joints and I have a G80 rear end.

 

[gmac310]

I hate to bring up an old thread but this is EXACTLY what mine is doing... I started noticing the 'slips like on gravel / shudder' after cruising at a constant speed for 10+ minutes....
Did the diff fluid change fix your problem?

No, unfortunately it was something more serious like three broken teeth in the rear diff.:sadcry:

 

[gmac310]

Mine is the 8.6"! I made sure of that when it failed before. There was no question at that point since The Roadie and AlekG did all the kind research before mine failed. Although my future may include a 4.10 9.5" from an SS.

I don't think the SS came with a 4.10 or a 9.5"

Correction: I guess the SS did come with a 4.10. Not sure on the 9.5" rear though.