tranny problem or clutch problem, can't tell..

[1slowdsm]

My guess would be that it's the tranny. I have the same problem with my 3rd and occassionally 5th gear. I have a (poorly) rebuilt tranny and the guy I got it from said something about the linkages being messed up. You can try stepping on the clutch pedal ALL the way down and see if that helps (does for my 3rd gear sometimes).