| Listed in parts books | Not catalogued by year yet |
GEAR 70 T120 FIRST GEAR
Mainshaft first gear for the T120 gearbox, listed as 57-3856.
This is the mainshaft first gear listed for the T120 gearbox, part number 57-3856. The catalog title carries it as "GEAR 70 T120 FIRST GEAR," and it comes up in other records tied to the same T120 gearbox cluster with a 16T tooth count noted alongside it.
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First gear sits inside the gearbox shell on the mainshaft and is what you're engaging when you select first from neutral. Wear here usually shows up as trouble selecting or holding first, or noise specific to that gear that clears up once you're up in the higher ratios.
We don't have a lot of catalog history on this particular listing beyond the description itself, so give us a call and we'll confirm it matches what's currently in your gearbox before you order.
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