National 710905 Manual Transmission Output Shaft Seal

Manual Transmission Output Shaft Seal for Ram

National 710905 is a manual transmission output shaft seal built for applications that need a precise sealing surface at the transmission output shaft. It uses a polyacrylate sealing material and a counter-clockwise spiral lip design to help maintain a consistent seal in demanding driveline service. This National 710905 oil seal is a direct-fit option for select Ram 2500 and Ram 3500 manual transmission applications.

Key Features

• Manual transmission output shaft seal for transmission sealing service
• Polyacrylate material for durable sealing performance
• Counter-clockwise-spiral lip design
• Inside diameter: 1.965 in. / 49.900 mm
• Outside diameter: 3.079 in. / 78.200 mm
• Width: 0.394 in. / 10.000 mm
• Overall width with side lip: 0.512 in. / 13.000 mm
• Housing bore: 3.071 in. / 78.000 mm

Detailed Description

National 710905 is an oil seal engineered for the manual transmission output shaft, where accurate dimensions and stable lip contact are critical. The seal measures 1.965 inches inside diameter, 3.079 inches outside diameter, and 0.394 inches in width, with a housing bore of 3.071 inches. Its polyacrylate construction and spiral lip profile are specified for controlled sealing at the shaft interface. This part number is used in select 2005-2010 Dodge Ram 2500 and Ram 3500 applications, as well as 2011-2018 Ram 2500 and Ram 3500 models. National 710905 also cross-references 5142724AA for the same application.

Common Repair Symptoms

• Transmission fluid seepage at the output shaft area
• Visible oil residue around the rear of the manual transmission
• Drips forming near the driveshaft connection
• Seal wear from age, heat, or shaft movement
• Leak diagnosis during manual transmission service on Ram 2500 and Ram 3500 trucks

Installation Notes and Tips

Confirm shaft diameter, housing bore, and seal orientation before installation. Clean the bore and shaft thoroughly, and inspect the output shaft surface for grooves or damage that could affect sealing. Proper alignment during installation is important to avoid lip distortion. Verify fitment by model year before ordering; National 710905 is listed for 2005-2010 Dodge Ram 2500 and Ram 3500, plus 2011-2018 Ram 2500 and Ram 3500 manual transmission applications.

Quality Assurance

National has supplied sealing solutions for more than 75 years and continues to develop sealing components for modern vehicle service needs. Part number 710905 is built to National’s dimensional and material specifications for transmission sealing applications.