The Eaton Fuller 4301777 is a mainshaft first-speed gear for heavy-duty manual transmissions. It is sold individually and carries cross-reference numbers including HF4301777, S-21405, S21405, F5HZ7100E, ZBF4301777, and 12380002, making it straightforward to verify against an existing part number or parts book. If you are working from a different catalog number, call us to confirm this is the correct gear for your transmission build. Pro Gear and Transmission is your source for genuine Eaton Fuller manual transmission components.
Features
Eaton Fuller OEM part number 4301777
Mainshaft 1st speed gear for heavy-duty manual transmissions
Sold individually (unit of measure: each)
Cross-references: HF4301777, S-21405, F5HZ7100E, ZBF4301777, 12380002
Alternate catalog formats: FUL-4301777, 3088-4301777
Genuine Eaton Fuller part available from Pro Gear and Transmission
