Eaton Fuller 4302421 Second-Speed Mainshaft Gear

Product Overview

Genuine Eaton Fuller 4302421 second-speed mainshaft gear for supported manual transmissions.

Technical Identification

• Replaces: 4302405 in supported Eaton catalogs
• Known assembly use: S-3055 and related model-specific mainshaft groups

Application and Service Notes

Confirm the complete transmission model and serial number, second-speed position, physical tooth count and helix, internal spline, width, washers and spacers, sliding clutch, mating countershaft gears, ratio set, and applicable serial range. Do not select this gear by diameter or appearance alone.

Please confirm 4302421, the transmission identification tag, second-speed position, teeth, spline, mating gears, ratio, and serial range before ordering.

Parts Verification and Ordering Notice

Please confirm the existing part number, component identification, dimensions, specifications, position, and application before ordering. Cross-reference numbers, parts catalogs, service manuals, repair manuals, PDF references, figures, and application information are reference material only and may contain errors, omissions, superseded information, or model-specific differences. Please contact All Truck Gears before ordering when the application or interchange is uncertain.

Technical References and OEM Documentation

• Eaton Inforanger — Mainshaft Group Showing 4302421
• Eaton Download Center — Illustrated Parts Lists and Overhaul Manuals