well for about 2.5 weeks iv had this vibration in my drivetrain took it to a shop for a free look over said i had a bad u joint not too bad wait another week to get paid go buy one i put my car on jak stands and pulled the driveshaft and there is no play in the u jionts look at my rear end pinion seal is gone oil all over floor pans and my differential cover gasket is also gone... i grabed the pinion shaft and i got about 1 cm of play in it....i have a feeling i killed it what di you guys think.