K-3721 Eaton Fuller Master Rebuild Kit

The Eaton Fuller Master Rebuild Kit K-3721 or K3721 is a comprehensive transmission overhaul kit covering the major wear and replacement components needed for a full rebuild. The kit includes countershaft gears, a main drive gear, sliding clutches, synchronizer assemblies (A-7254 Low-S and A-7331 Aux Direct), a range slave valve assembly, splitter cover assembly, input shaft assembly, retainer assembly, front bearing cover, main case countershaft front bearings, reverse gear idler shaft bearings, O-ring kits, a complete gasket kit, oil seal with slinger, shim kit, air hose assemblies, and an air filter/regulator assembly. Also referenced as HFK-3721. Call us to confirm proper fit for your application.

Features

Includes Low-S synchronizer assembly (A-7254) and Aux Direct sync assembly (A-7331)
Covers main drive gear, countershaft gears, and sliding clutch components
Includes range slave valve assembly (A-5000) and air filter/regulator assembly (A-4740)
Complete gasket kit (K-2199), O-ring kit (K-2804), shim kit (K-2805), and oil seal with slinger (K-2262) included
Air hose assemblies, fittings, and splitter cover assembly (A-6863) included
Also referenced as HFK-3721

Additional Information

Kit K-3721 Bill of Materials highlights:
Bushing, CL Rel Shaft (12815) x4
Snap Rings (14317, 14750, 16980, 4301254)
Disc, Magc (14373) x3
Springs including Pos Finder Spring (15918) x3
Front Bearing Cover (20550) x1
Bearing (21356-BOX) x1
Countershaft Gears (4300191) x2, Gear C/S (4307114) x2
Main Drive Gear (4307126) x1
Sliding Clutch (4306647) x1, Clutch SLG (4301840) x1
Yoke, 3rd and 4th (4305575) x1
Main Case Countershaft Bearing - Front (4308397) x2
Reverse Gear Idler Shaft Bearing (4308403) x2
Input Shaft Assembly S-1659 x1
Retainer Assembly A-8030 x1
Splitter Cover Assembly A-6863 x1
Range Slave Valve Assembly A-5000 x1
Air Filter/Regulator Assembly A-4740 x1
Low-S Synchronizer Assembly A-7254 x1
Aux Direct Synchronizer Assembly A-7331 x1
Gasket Kit K-2199 x1
Oil Seal with Slinger K-2262 x1
O-Ring Kit Complete K-2804 x1
Shim Kit K-2805 x1
Air Hose Assemblies (55509 x2, 55518 x1, 55527 x1)
Sealant (71205) x1, Silicone Lubricant (71206) x1
Instruction Letter L-2013-05 x1