The Eaton Fuller mainshaft 1st speed gear, part number 20389 or 20389-SP, is a manual transmission gear for heavy-duty truck applications. This gear measures 8.5 inches in diameter and 1.5 inches in height. It cross-references a broad range of part numbers including 19246, 20389SP, S-7224, S7224, EF62640HP, E2HZ7100E, 35530210, and SAS-20389, making it a frequent replacement candidate across multiple fleet and shop sourcing channels. If you are matching this part to a specific Eaton Fuller transmission model, call us to confirm proper fit for your application.
Features
Mainshaft 1st speed gear for Eaton Fuller heavy-duty manual transmissions
8.5 in. diameter, 1.5 in. height
Cross-references: 19246, 20389-SP, 20389SP, S-7224, EF62640HP, E2HZ7100E, SAS-20389, 35530210
Alternate supplier part numbers: HF20389, FUL-20389, ZBF20389, 3088-20389
Sold individually (unit of measure: each)
Genuine Eaton Fuller part, available from Pro Gear and Transmission
Tech Specs
- Part Number: 20389
- Alternate Part Number: 20389-SP
- Part Type: Mainshaft 1st Speed Gear
- Transmission Type: Heavy-Duty Manual Transmission
- Diameter: 8.5 in.
- Height: 1.5 in.
- Cross-References: 19246, 20389SP, S-7224, S7224, EF62640HP, E2HZ7100E, 35530210, SAS-20389, HF20389, FUL-20389, ZBF20389, 3088-20389, 27201-5208
