Originally Posted by cgv988
when in neutral at a stop if i release the clutch i hear something start to grind under the car -- not like a gear grinding but like a constant noise of like 2 things constantly grinding. push the clutch back in and it stops.
Sounds exactly like my issue. Although I don't have the violence at high speed. The exact problem you described above was just diagnosed on my TJ as worn/bad input-shaft bearings. It was originally mis-diagnosed a few times as the throw-out bearing. It can be heard anytime the clutch is not engaged. I didn't hear it while driving at first, but before long I could hear it in all gears as any speed. And logically, the higher rpm's your turning, the faster, louder, and possibly, more "violent" it will sound. In the last 3 weeks mine has worsened quite a bit and is scheduled for replacement this week.