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National 370047A Wheel Seal - Rear Inner
National 370047A Wheel Seal for Ford Rear Inner Axles
National 370047A is an oil bath wheel seal built for rear inner axle service on select Ford F-250 and Ford F-350 applications. It uses nitrile material and a Redicoat finish to support sealing performance in demanding driveline environments.
Key Features
- Wheel seal / oil bath seal style for rear inner axle positions
- Nitrile construction for sealing durability
- Redicoat finish
- Outside diameter: 4.761 in. (120.930 mm)
- Housing bore: 4.755 in. (120.780 mm)
- Shaft diameter: 3.437 in. (87.300 mm)
- Width: 0.700 in. (15.370 mm)
- Installation tool reference: RD277
Detailed Description
National 370047A is engineered as a rear inner wheel seal for oil bath axle assemblies. It is listed for Ford F-250 and Ford F-350 rear inner applications, including full-floating setups noted in the fitment data. The seal dimensions, nitrile material, and housing bore sizing are specified to match the axle sealing interface used in these trucks. This part cross-references SKF 34384 and Timken 11S34370 for the same application. National 370047A is a direct-fit sealing solution for 1985-1999 Ford F-250 and 1986-1998 Ford F-350 rear inner service where the listed axle notes apply.
Common Problems This Seal Addresses
- Gear oil leakage at the rear inner wheel seal
- Contamination entering the oil bath axle assembly
- Seal wear from heat, age, or mileage
- Moisture intrusion around the axle sealing surface
- Service issues on Ford F-250 and Ford F-350 rear inner axle assemblies
Installation Notes and Tips
Verify axle style, housing bore, shaft diameter, and seal dimensions before installation. Use the listed installation tool reference RD277 when servicing the seal to help seat it correctly and reduce the risk of damage during installation. Clean the sealing surfaces thoroughly and inspect the axle shaft and bore for wear or scoring before assembly. Compatible with 1985-1999 Ford F-250, rear inner; 1986-1998 Ford F-350, rear inner; 1997 Ford F-250 HD, rear inner; and 1985 Ford F-350, rear inner, according to the fitment notes.
Quality Assurance
National has supplied sealing products for more than 75 years and continues to develop sealing solutions for modern vehicle service needs. National 370047A is part of the 370000 series and is built to the published dimensional specifications for the listed Ford rear inner applications.
| Brand | National |
|---|---|
| Part Number | 370047A |
| Housing Bore | 4.755 |
| Housing Bore | 120.780 |
| Housing Bore (Inch) | 4.755 |
| Housing Bore (MM) | 120.780 |
| Installation Tool | RD277 |
| Material | Nitrile |
| Outside Diameter | 4.761 |
| Outside Diameter | 120.930 |
| Outside Diameter (Inch) | 4.761 |
| Outside Diameter (mm) | 120.930 |
| Part Description | Oil Bath Seal |
| Redicoat | Yes |
| Series | 370000 |
| Shaft (Inch) | 3.437 |
| Shaft (MM) | 87.300 |
| Shaft Diameter | 3.437 |
| Shaft Diameter | 87.300 |
| Type | 06 |
| Unit of Dimension | Inch |
| Width | 0.700 |
| Width | 15.370 |
| Width (Inch) | 0.700 |
| Width (mm) | 15.370 |
This part fits 30 vehicles. Search below:
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 1999 | Ford | F-250 | Rear Inner | Oil Bath Seal Style; Full-Floating; Nitrile; with 10.25 (in) Ring Gear |
| 1998 | Ford | F-250 | Rear Inner | Oil Bath Seal Style; Full-Floating; Nitrile; with 10.25 (in) Ring Gear |
| 1998 | Ford | F-350 | Rear Inner | Oil Bath Seal Style; Nitrile |
| 1997 | Ford | F-250 | Rear Inner | Oil Bath Seal Style; Full-Floating; Nitrile; with 10.25 (in) Ring Gear |
| 1997 | Ford | F-250 HD | Rear Inner | Oil Bath Seal Style; Full-Floating; Nitrile; with 10.25 (in) Ring Gear |
| 1997 | Ford | F-350 | Rear Inner | Oil Bath Seal Style; Nitrile |
| 1996 | Ford | F-250 | Rear Inner | Oil Bath Seal Style; Full-Floating; Nitrile; with 10.25 (in) Ring Gear |
| 1996 | Ford | F-350 | Rear Inner | Oil Bath Seal Style; Nitrile |
| 1995 | Ford | F-250 | Rear Inner | Oil Bath Seal Style; Full-Floating; Nitrile; with 10.25 (in) Ring Gear |
| 1995 | Ford | F-350 | Rear Inner | Oil Bath Seal Style; Nitrile |
| 1994 | Ford | F-250 | Rear Inner | Oil Bath Seal Style; Full-Floating; Nitrile; with 10.25 (in) Ring Gear |
| 1994 | Ford | F-350 | Rear Inner | Oil Bath Seal Style; Nitrile |
| 1993 | Ford | F-250 | Rear Inner | Oil Bath Seal Style; Full-Floating; Nitrile; with 10.25 (in) Ring Gear |
| 1993 | Ford | F-350 | Rear Inner | Oil Bath Seal Style; Nitrile |
| 1992 | Ford | F-250 | Rear Inner | Oil Bath Seal Style; Full-Floating; Nitrile; with 10.25 (in) Ring Gear |
| 1992 | Ford | F-350 | Rear Inner | Oil Bath Seal Style; Nitrile |
| 1991 | Ford | F-250 | Rear Inner | Oil Bath Seal Style; Full-Floating; Nitrile; with 10.25 (in) Ring Gear |
| 1991 | Ford | F-350 | Rear Inner | Oil Bath Seal Style; Nitrile |
| 1990 | Ford | F-250 | Rear Inner | Oil Bath Seal Style; Full-Floating; Nitrile; with 10.25 (in) Ring Gear |
| 1990 | Ford | F-350 | Rear Inner | Oil Bath Seal Style; Nitrile |
| 1989 | Ford | F-250 | Rear Inner | Oil Bath Seal Style; Full-Floating; Nitrile; with 10.25 (in) Ring Gear |
| 1989 | Ford | F-350 | Rear Inner | Oil Bath Seal Style; Nitrile |
| 1988 | Ford | F-250 | Rear Inner | Oil Bath Seal Style; Full-Floating; Nitrile; with 10.25 (in) Ring Gear |
| 1988 | Ford | F-350 | Rear Inner | Oil Bath Seal Style; Nitrile |
| 1987 | Ford | F-250 | Rear Inner | Oil Bath Seal Style; Full-Floating; Nitrile; with 10.25 (in) Ring Gear |
| 1987 | Ford | F-350 | Rear Inner | Oil Bath Seal Style; Nitrile |
| 1986 | Ford | F-250 | Rear Inner | Oil Bath Seal Style; Full-Floating; Nitrile; with 10.25 (in) Ring Gear |
| 1986 | Ford | F-350 | Rear Inner | Oil Bath Seal Style; Nitrile |
| 1985 | Ford | F-250 | Rear Inner | Oil Bath Seal Style; Full-Floating; Nitrile; with 10.25 (in) Ring Gear |
| 1985 | Ford | F-350 | Rear Inner | Oil Bath Seal Style; Nitrile; with 10.25 (in) Ring Gear |
* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
This part directly replaces or is cross-referenced with the following part numbers:
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.