hELP!!! Ok, I'll simmer down a bit... I left the Blazer parked for the weekend and came back and started it up this morning to go to work no problems...parked it and came out for lunch and drove it, weird [censored] was happening.... a weird rumbling-vibration comeing from somewhere...think it was coming from the engine/tranny-maybee even the x-case...I really don't think it was the rear diff...I looked underneath and the tranny/x-case were sort of shaking and rumbling...didn't look normal...anyone have any ideas why this would all of a sudden start for no reason???...what are some suggestions/ideas/things to look for??? Yep!! It's definatly a jEEP thing...So, what your excuse???