I've been noticing lately that while shifting up hard through the gears, when I let up on the clutch, and re-engage the tranny, I hear a faint sound. The best way to describe it is like a squeek. Not from the petals. It's absolutely coming from the transmission. It makes me think that perhaps there's a bit of slipage going on there due to the high rpms. Anybody have this happening or any other ideas what this is?