Mack Eaton Fuller Input Shaft Pinion 4304539 3088-4304539

Mack Eaton Fuller Input Shaft Pinion 4304539 3088-4304539

*Please verify your OEM number(s) before purchasing.

When your rig demands rock‑solid shifting, drop in this Eaton Fuller input shaft pinion and get back on the road fast.

• Input Shaft Pinion
• Fits Various Mack Make And Models
• Fits Various Eaton Fuller Transmissions:
  • 5405
  • 5406
  • 5506
  • 6406
  • 8406
• Direct Aftermarket Replacement For OEM #s:
  • Fuller: 4304539
  • Mack: 3088-4304539
  • Mack: 2719-4304539
• Sold Individually

Ensure seamless power delivery in your Eaton Fuller transmission with this precision‑machined input shaft pinion. Designed as a direct aftermarket replacement for OEM #4304539 (Fuller, Mack, Eaton Corp), it fits 5405, 5406, 5506, 6406, and 8406 series models. Crafted from high‑strength alloy steel and heat‑treated for lasting wear resistance, this pinion provides the alignment and durability your drivetrain needs for smooth, reliable operation. Installing this high‑quality aftermarket component restores factory‑spec performance and keeps your truck shifting like new.

Any mention of OEM names or OEM product ID numbers/descriptions/model numbers is intended for identification purposes only and does not indicate that it is an OEM part.

If you should need additional truck parts and accessories, please don't hesitate to call our toll-free number: 1-888-888-7990