If it is a manual transmission it may make a whining noise or, if it is really falling apart, a grinding sound. If it is an automatic, they usually don't make any particular noise. Most of the functions are pressure valves so the transmission just doesn't shift properly or won't move when in gear. If you are geyying a grinding noise but the transmission seems to be functioning okay you probably need to have the flywheel inspected to see if the starter is dragging or the flywheel has broken or cracked.
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