Eaton Fuller 4300241 Legacy First-Speed Countershaft Gear

Product Overview

Genuine Eaton Fuller 4300241 legacy first-speed countershaft gear for supported manual transmissions. Eaton model-specific catalogs identify 21025 as a replacement for 4300241 in some applications; this listing retains 4300241 because the physical inventory may be genuine old-stock bearing the legacy number.

Application and Service Notes

Confirm the physical part or package label, complete transmission model and serial number, whether 4300241 or replacement 21025 is required, upper/lower countershaft arrangement, physical tooth count and helix, bore and key fit, mating first-speed mainshaft gear, quantity, ratio set, and serial range.

Please confirm 4300241 on the physical item, the transmission identification tag, first-speed position, teeth, countershaft configuration, replacement status, mating gear, quantity, and ratio before ordering.

Parts Verification and Ordering Notice

Please confirm the existing part number, component identification, dimensions, specifications, replacement status, position, quantity, 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PDF references, figures, and application information are reference material only and may contain errors, omissions, superseded information, or model-specific differences.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 — Countershaft Group Showing 21025 Replacement for 4300241
• Eaton Download Center — Illustrated Parts Lists and Overhaul Manuals