| Also known as | T4391 |
| Diagram | Fig. 12 — GEARBOX SHAFTS AND GEARS—T150V (5 SPEED) · ref 23 |
| Subsystem | gearbox |
| Listed in parts books | 1971–1972 |
GEAR,L/S 1ST 72 T120
Layshaft first gear (72 tooth) for the T120 gearbox, part number 57-4391.
This is a layshaft first gear for the T120 gearbox, listed in our records as a 72-tooth gear. The layshaft is one of the two shafts inside the gearbox that gets you from the kickstart or clutch input down through the gear ratios to the output sprocket, and first gear on that shaft is what you're engaging when you drop the lever into first at a stop.
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Our catalog entry for this one is brief, so we don't have more detail on it beyond the part number and the tooth count noted above. If you're rebuilding a T120 gearbox and need to confirm this is the right first gear for your particular internals, give us a call and we'll go over it with you before you order.
Sorry if we got something wrong here. If you think this information isn't correct, .