The Eaton Fuller mainshaft 4th gear, part number 21663, is a direct-replacement transmission gear for the Fuller 6613 transmission. This part cross-references to Navistar 1660387C1, making it a useful reference when sourcing. Sourced as a genuine Eaton Fuller component and sold by Pro Gear and Transmission, this gear fits the specific gear position and transmission model noted above. If you are confirming fit for a particular truck or application, call us and we will help you verify before you order.
Features
Eaton Fuller part number 21663
Fits Fuller 6613 transmission
4th position mainshaft gear
Cross-references to Navistar 1660387C1
Sold by Pro Gear and Transmission
Tech Specs
- Part Number: 21663
- Part Type: Mainshaft 4th Gear
- Application: Fuller 6613 Transmission
- Cross-Reference - Navistar: 1660387C1
- Sell Pack: 1 Each
