I had a weird sound coming from my bell housing so I changed out my flywheel clutch, 26 spline input shaft and input shaft sleeve. When I pulled the tranny out I found out that the shaft had totally separated from the tranny. The throwout bearing was pretty much stuck to the sleeve and when you would press the clutch in, it would smack into the flywheel causing the weird sound. I'm glad I upgraded all of these parts. Its great insurance so you don't have something worse than noise happen.