Is the vibration at a certain speed or RPM??, If it is at a certain speed i would think maybe the drive shaft. I put new gears in my rear and had a terrible vibration at about 55 to 65 MPH, it felt like the whole car was going to fall apart. I had the stock drive shaft rebalanced and everthing and that helped a little but still it was there, so i finally took everyones advice and bought the FMS Aluminum drive shaft and it worked like a champ, just something was up with the stock one...go figure....good luck tho hope you figure it out!!!
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