Recently started getting a vibration in my first gear. It only starts when I pass 2000 rpm and stops if I shift into second gear. I have a 92 cherokee 2dr sport 5 speed. Could it be the transmission mounts? Or could it be the clutch because the clutch only works when it is almost completely back to original position. All advice is helpful. This is a new problem but I don't know what to do and money is tight. Please help