National 223255 Manual Transmission Input Shaft Seal - Front, Front Inner or Rear

National 223255 Manual Transmission Input Shaft Seal

National 223255 is a metric manual transmission input shaft seal built with nitrile sealing material for dependable oil control at the transmission input shaft. With a 1.260 in. shaft size, 2.058 in. outside diameter, and 0.276 in. width, it is sized for specific front and rear applications across select Chevrolet, GMC, Mitsubishi, Dodge, Oldsmobile, and Saab vehicles.

This seal is a direct-fit service part for applications such as Chevrolet S10, GMC Sonoma, and Saab 9-2X configurations listed below. National 223255 is also referenced by SKF 12494 and Beck/Arnley 052-1401 for the same application.

Key Features

• Manual transmission input shaft seal for transmission sealing service
• Nitrile sealing material for oil resistance
• Metric dimensions: 32.000 mm shaft size, 52.280 mm outside diameter, 7.000 mm width
• Housing bore: 52.000 mm
• National Series 220000, Type 35
• Part number 223255 for catalog lookup and service matching

Detailed Description

National 223255 is an oil seal engineered for manual transmission input shaft applications where precise dimensional fit matters. The seal uses nitrile material and measures 1.260 in. inside diameter, 2.058 in. outside diameter, and 0.276 in. thickness, making it suitable for the specified transmission and axle-related service positions in the fitment list. National has supplied sealing solutions for more than 75 years, and this part reflects that focus on dimensional accuracy and modern vehicle service needs. If you are sourcing a National 223255 replacement for a Chevrolet Astro, GMC Jimmy, or Mitsubishi Montero application, verify the listed position and notes before installation.

Compatible With select Chevrolet Astro, Blazer, S10, and GMC Safari applications, as well as Saab 9-2X rear differential service and Mitsubishi PTO-equipped models listed in the fitment data. National 223255 is also a useful reference when cross-checking SKF 12494 or Beck/Arnley 052-1401.

What It Helps Address

• Transmission fluid seepage at the input shaft
• Oil leakage around the seal housing bore
• Wear-related sealing loss in manual transmission service
• Replacement needs during drivetrain maintenance on listed Chevrolet, GMC, Mitsubishi, Dodge, Oldsmobile, and Saab vehicles
• Fitment matching for metric seal dimensions in service work

Installation Notes and Tips

Confirm the shaft diameter, housing bore, width, and application notes before installation. This part is listed for multiple positions, including front, front inner, rear, and N/A PTO-related applications, so match the vehicle, year, and configuration exactly. Clean the bore and shaft surface thoroughly, inspect for scoring or wear, and install the seal squarely to avoid distortion. For vehicles such as the Chevrolet S10, GMC Sonoma, and Saab 9-2X, verify the differential or transmission configuration noted in the fitment table.

Quality Assurance

National is a long-established sealing brand with more than 75 years of experience in sealing technology. Part number 223255 is built to the listed metric dimensions and material specification for consistent service replacement.

Fitment

• Fits 2005-2006 Saab 9-2X, rear, with Subaru R160 Differential; with Posi-Traction; 2.047 (in) Inside Diameter
• Fits 1995-1996 Chevrolet Astro, front inner, for vehicles with a 7.25-inch Ring Gear and AAM Axle, featuring Independent Front Suspension.
• Fits 1995-1996 Chevrolet Blazer, front inner, for vehicles with a 7.25-inch Ring Gear and AAM Axle, featuring Independent Front Suspension.
• Fits 1995-1996 Chevrolet S10, front inner, for vehicles with a 7.25-inch Ring Gear and AAM Axle, featuring Independent Front Suspension.
• Fits 1995-1996 GMC Jimmy, front inner, for vehicles with a 7.25-inch Ring Gear and AAM Axle, featuring Independent Front Suspension.
• Fits 1995-1996 GMC Safari, front inner, for vehicles with a 7.25-inch Ring Gear and AAM Axle, featuring Independent Front Suspension.
• Fits 1995-1996 GMC Sonoma, front inner, for vehicles with a 7.25-inch Ring Gear and AAM Axle, featuring Independent Front Suspension.
• Fits 1991-1996 Mitsubishi Montero, N/A, with Mitsubishi M1S5 Power Take-Off (PTO)
• Fits 1996 Oldsmobile Bravada, front inner, for vehicles with a 7.25-inch Ring Gear and AAM Axle, featuring Independent Front Suspension.
• Fits 1990-1994 Chevrolet Astro, front, Manual Transmission Input Shaft Seal fits with 7.25in Ring Gear, GMC Axle, Carrier Unit Independent.
• Fits 1983-1994 Chevrolet S10, front, Manual Transmission Input Shaft Seal fits with 7.25in Ring Gear, GMC Axle, Carrier Unit Independent.
• Fits 1983-1994 Chevrolet S10 Blazer, front, Manual Transmission Input Shaft Seal fits with 7.25in Ring Gear, GMC Axle, Carrier Unit Independent.
• Fits 1992-1994 GMC Jimmy, front, Manual Transmission Input Shaft Seal fits with 7.25in Ring Gear, GMC Axle, Carrier Unit Independent.
• Fits 1990-1994 GMC Safari, front, Manual Transmission Input Shaft Seal fits with 7.25in Ring Gear, GMC Axle, Carrier Unit Independent.
• Fits 1991-1994 GMC Sonoma, front, Manual Transmission Input Shaft Seal fits with 7.25in Ring Gear, GMC Axle, Carrier Unit Independent.
• Fits 1990-1994 Mitsubishi Mighty Max, N/A, with Mitsubishi M1S5 Power Take-Off (PTO)
• Fits 1991-1994 Oldsmobile Bravada, front, Manual Transmission Input Shaft Seal fits with 7.25in Ring Gear, GMC Axle, Carrier Unit Independent.
• Fits 1990-1993 Dodge Ram 50, N/A, with Mitsubishi M1S5 Power Take-Off (PTO)
• Fits 1983-1991 GMC S15 Jimmy, front, Manual Transmission Input Shaft Seal fits with 7.25in Ring Gear, GMC Axle, Carrier Unit Independent.
• Fits 1983-1990 GMC S15, front, Manual Transmission Input Shaft Seal fits with 7.25in Ring Gear, GMC Axle, Carrier Unit Independent.
• Fits 1989 Dodge Raider, N/A, with Mitsubishi M1S5 Power Take-Off (PTO)