1999 Nissan Altima Q&A
1999 Nissan Altima Question: Manual transmission makes noise when under load going forward. Not in neutral.
Check the transmission for oil or perhaps just change the oil as a precaution. If it makes noise in all gears and not in neutral or the clutch pedal depressed the bearings in the transmission may be bad requiring the transmission to be overhauled. - patrick mannion