Now we're getting to the nitty-gritty. Is your drive shaft bent or out of balance? You can check the driveshaft for bend by lifting the rear wheels and setting a jack stand close to the center of the shaft with a pointer taped to it. A pencil, screwdriver, anything will work, and spin the shaft by hand while watching the clearance. It doesn't take much warp to make a shaft wobble at 3,000 rpm. The balance can only be checked accurately by a rebuild shop. Let me know.
Saturday, December 13th, 2008 AT 1:21 PM