The Eaton Fuller K-3257 or K3257 Basic Overhaul Kit covers the core internal components needed for a full transmission overhaul. The kit includes multiple bearings, among them the input shaft bearing (4308451), main case countershaft front bearings (4308397 x2), and reverse gear idler shaft bearings (4308403 x2), along with a sliding clutch (4306648), snap rings, position-finder springs, an o-ring kit (K-2054), a gasket kit (K-2061), a shim kit (K-2805), an oil seal kit for the electrical cover (K-2918), sealant, connectors, collets, and three instruction letters. Call us to confirm fitment for your specific transmission build.
Interchanges:
- 89850
- EF89850
- HFK-3257
Features
Includes input shaft bearing (4308451), main case countershaft front bearings (4308397), and reverse gear idler shaft bearings (4308403)
Sliding clutch (4306648) and position-finder springs included
O-ring kit (K-2054), gasket kit (K-2061), and shim kit (K-2805) bundled in one package
Oil seal kit for electrical cover (K-2918) included
Sealant, straight and elbow connectors, and collets also supplied
Three Eaton instruction letters (L-1680, L-3887, L-3987) included for installation guidance
Tech Specs
- Kit Part Number: K-3257 or K3257
- O-Ring Kit: K-2054
- Gasket Kit: K-2061
- Shim Kit: K-2805
- Oil Seal Kit (Electrical Cover): K-2918
- Input Shaft Assembly: S-1659
- Input Shaft Bearing: 4308451 (x1)
- Main Case Countershaft Bearing - Front: 4308397 (x2)
- Reverse Gear Idler Shaft Bearing: 4308403 (x2)
- Sliding Clutch: 4306648 (x1)
- Snap Rings: 14317 (x2), 14750 (x1), 16763 (x1), 16980 (x1)
- Springs: 14897 (x3), Position Finder 15918 (x3)
- Instruction Letters: L-1680, L-3887, L-3987
