Lubricate the unit

Check and realign

Adjust clutch pedal free play

Re - install springs correctly

Synchronizing unit stuck

Bearing worn out or dry

Synchronizer defective

Synchronizer worn-out

Noise in gear shifting

Gear slip

Gear locked in one gear

Gear clash during shifting

Bearing worn out

Synchronizing unit damaged

Synchronizing unit stuck

Fly wheel ring wornout

Sliding mesh gear box

Synchromesh gear box

Constant mesh gear box

Compound wheel mesh gear box