National 710904 Manual Transmission Input Shaft Seal

Manual Transmission Input Shaft Seal for Ram

The National 710904 manual transmission input shaft seal is built for applications that need a precise seal at the transmission input shaft. It uses a fluoro-elastomer sealing material and a clockwise-spiral lip design to help maintain sealing performance in demanding drivetrain conditions.

• Manual transmission input shaft seal for select Ram and Dodge Ram trucks
• Fits 2011-2018 Ram 2500 and 2011-2018 Ram 3500
• Fits 2005-2010 Dodge Ram 2500 and 2005-2010 Dodge Ram 3500
• Fluoro-elastomer construction for sealing durability
• Clockwise-spiral lip design
• Inside diameter: 1.567 in. / 39.800 mm
• Outside diameter: 2.449 in. / 62.200 mm
• Thickness/width: 0.315 in. / 8.000 mm
• Housing bore: 2.441 in. / 62.000 mm

Detailed Product Information

National 710904 is an oil seal in the 710900 series, engineered for the manual transmission input shaft interface. The seal dimensions are 1.567 inches inside diameter, 2.449 inches outside diameter, and 0.315 inches thick, with a 62.000 mm housing bore specification. Its fluoro-elastomer material and spiral lip profile support sealing at the shaft opening where transmission fluid retention is critical. This part cross-references OE-style numbers such as 5142735AA and 05142735AA for the same application. National 710904 is a direct-fit option for Ram 2500 and Ram 3500 trucks across the listed model years.

Common Problems This Seal Addresses

• Transmission fluid seepage at the input shaft area
• Oil residue around the bellhousing or transmission case
• Seal wear from shaft rotation and heat exposure
• Loss of sealing integrity during manual transmission service
• Replacement needs after clutch or transmission repair

Installation Notes

Verify shaft diameter, housing bore, and seal orientation before installation. Clean the bore and shaft surface thoroughly, and inspect for scoring or wear that could affect sealing. Install the seal squarely to avoid lip damage and confirm the spiral lip direction matches the application requirements. For Ram 2500 and Ram 3500 manual transmission service, confirm the part number 710904 against the vehicle’s transmission specification before assembly.

Quality Assurance

National has supplied sealing products for more than 75 years and develops sealing solutions for modern vehicle applications. Part number 710904 reflects that sealing-focused engineering approach for manual transmission service.