Okay so I have the car up on jacks right now in the garage, and I am trying to fix the "thump" when I press the gas and let off. I was told by a few people to check the driveshaft bolts to make sure they are tight. Where are they? I can't find shi#. I tightened up those two bolts that hold that big rubber bumper deal under the yoke, but I don't think that does anything. Also, when in gear, the drive shaft has a lot of play in it. Does that mean I have to replace my diff. bushings? I'm just trying to illeviate from taking it in the shop and getting raped on labor, etc.