I have a 2006 tj. Had a vibration in the front end at about 35 40 mph. Inspected the front drive shaft and noticed the weight was missing. I removed the front drive shaft. Vibration is still there not a bad but still there. Funny thing is it's only while on the gas pedal. As soon as you let off the gas the Vibration almost goes away. As soon as you touch the gas again it's back. Any ideas or help is much appreciated.