Mack Trucks Incorporated 3088-4300190 Mainshaft Gear, also listed as K4300190, is a replacement gear for Eaton Fuller transmissions used in Mack trucks. This mainshaft gear is part of the transmission assembly and is designed to engage with adjacent gears on the main shaft to transfer drive within a manual Eaton Fuller transmission. The part numbers 3088-4300190 and K4300190 refer to the same component, enabling cross-reference in Mack and Eaton Fuller catalogs. Use this part when restoring or maintaining the mainshaft gear in compatible Mack/Eaton Fuller transmissions.
