I had a similar problem just a couple of months ago. What did yours sound like? Mine would make a grinding noise whenever my foot was off the clutch (e.g) in nuetral foot off cluch or in a gear with the foot off the clutch. Whenever I would step on the clutch the noise would go away. It ended up being a bad input shaft bearing. My truck is a 94' hb 4x4 5spd. I think that you need a press to get the new bearing on. Good luck, let us know how it went.