Strange grinding noise in 1st gear...

While taking off, toward the upper part of the RPM band I hear a stranger grinding / clunking noise coming from the tranny. After I shift into second the noise goes away and this only happens in 1st gear. Any ideas? I have a shoft through shifter and I have bumped the shift linkage on a speed bump before (but who has not done that.). I just need to know if I should be worried. Thanks.
:)

its prolly your first gear is just grindin some teeth.

If that's the case. It's time for a swap.:D

Thanks for the help, I'll have to check this out next time I do the clutch.
:)

umm try and get your tranny fluid changed, it might help. its cheap too