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NationalPart #: 3747
National 3747 Wheel Seal - Rear
112 vehicles fit this part
Select your vehicle to confirm fitment
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OE Direct Replacement — Bolt-on fit, no modifications needed
Fitment: Chevrolet and GMC, G30, R2500 Suburban, V2500 Suburban, G3500, P20, R2500, P2500, R20, R20 Suburban, V20 Suburban, V20, V2500, C20, C20 Suburban, K20, K20 Suburban, C2500, C2500 Suburban, K2500, and K2500 Suburban
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National 3747 Wheel Seal for Rear Axles
National 3747 is a rear wheel seal built for older Chevrolet and GMC heavy-duty trucks and vans with a 9.5 inch ring gear. It uses a nitrile sealing material and a bi-directional lip design to help maintain a consistent seal at the wheel end.
- Wheel seal / oil seal for rear axle applications
- Nitrile construction for sealing performance
- Bi-directional lip design
- Redi-Coat treated surface
- Inside diameter: 1.703 in / 43.260 mm
- Outside diameter: 3.090 in / 78.490 mm
- Housing bore: 3.084 in / 78.330 mm
- Width: 0.500 in / 12.700 mm
Fitment and application details
This National 3747 seal is used on rear axle positions for a range of Chevrolet and GMC models, including Chevrolet G30, R2500 Suburban, V2500 Suburban, P20, R2500, R20, R20 Suburban, V20 Suburban, V20, C20, C20 Suburban, K20, K20 Suburban, and GMC G3500, R2500 Suburban, V2500 Suburban, P2500, R2500, V2500, C2500, C2500 Suburban, K2500, and K2500 Suburban. It is listed for 1981-1991 applications, with notes calling out vehicles equipped with a 9.5 inch ring gear where specified.
This part cross-references Centric Parts 417.66012 for the same application.
What this seal helps address
- Rear wheel-end oil leakage
- Contamination entering the axle seal area
- Seal wear from age, heat, and road exposure
- Loss of sealing integrity around the housing bore and shaft surface
Installation notes and tips
Verify the axle housing bore, shaft diameter, and seal dimensions before installation. National 3747 measures 1.703 inches on the shaft side, 3.090 inches outside diameter, and 0.500 inches wide, so matching the seal to the axle specification is important for proper seating. Confirm rear-position fitment and ring gear notes for Chevrolet and GMC applications before assembly.
Quality assurance
National has supplied sealing products for more than 75 years and continues to develop sealing solutions for current and legacy vehicles. The 3747 wheel seal reflects that focus with an OE-style fit and material selection suited to driveline sealing service.
| Brand | National |
|---|---|
| Part Number | 3747 |
| Helix Type | Bi-Directional Lip Design |
| Housing Bore (Inch) | 3.084 |
| Housing Bore (MM) | 78.330 |
| Inside Diameter | 1.703 |
| Inside Diameter | 43.260 |
| Material | Nitrile |
| Outside Diameter | 3.090 |
| Outside Diameter | 78.490 |
| Outside Diameter (Inch) | 3.090 |
| Outside Diameter (mm) | 78.490 |
| Part Description | Oil Seal |
| Redicoat | Yes |
| Series | 3000 |
| Shaft (Inch) | 1.703 |
| Shaft (MM) | 43.260 |
| Type | 69 |
| Unit of Dimension | Inch |
| Width (Inch) | 0.500 |
| Width (mm) | 12.700 |
This part fits 112 vehicles. Search below:
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 1991 | Chevrolet | G30 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1991 | Chevrolet | R2500 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1991 | Chevrolet | V2500 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1991 | GMC | G3500 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1991 | GMC | R2500 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1991 | GMC | V2500 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1990 | Chevrolet | G30 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1990 | Chevrolet | R2500 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1990 | Chevrolet | V2500 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1990 | GMC | G3500 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1990 | GMC | R2500 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1990 | GMC | V2500 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1989 | Chevrolet | G30 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1989 | Chevrolet | P20 | Rear | |
| 1989 | Chevrolet | R2500 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1989 | Chevrolet | R2500 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1989 | Chevrolet | V2500 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1989 | GMC | G3500 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1989 | GMC | P2500 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1989 | GMC | R2500 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1989 | GMC | R2500 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1989 | GMC | V2500 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1988 | Chevrolet | G30 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1988 | Chevrolet | P20 | Rear | |
| 1988 | Chevrolet | R20 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1988 | Chevrolet | R20 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1988 | Chevrolet | V20 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1988 | GMC | G3500 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1988 | GMC | P2500 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1988 | GMC | R2500 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1988 | GMC | R2500 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1988 | GMC | V2500 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1987 | Chevrolet | G30 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1987 | Chevrolet | P20 | Rear | |
| 1987 | Chevrolet | R20 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1987 | Chevrolet | R20 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1987 | Chevrolet | V20 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1987 | Chevrolet | V20 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1987 | GMC | G3500 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1987 | GMC | P2500 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1987 | GMC | R2500 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1987 | GMC | R2500 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1987 | GMC | V2500 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1987 | GMC | V2500 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1986 | Chevrolet | C20 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1986 | Chevrolet | C20 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1986 | Chevrolet | G30 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1986 | Chevrolet | K20 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1986 | Chevrolet | K20 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1986 | Chevrolet | P20 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1986 | GMC | C2500 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1986 | GMC | C2500 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1986 | GMC | G3500 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1986 | GMC | K2500 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1986 | GMC | K2500 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1986 | GMC | P2500 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1985 | Chevrolet | C20 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1985 | Chevrolet | C20 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1985 | Chevrolet | G30 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1985 | Chevrolet | K20 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1985 | Chevrolet | K20 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1985 | Chevrolet | P20 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1985 | GMC | C2500 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1985 | GMC | C2500 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1985 | GMC | G3500 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1985 | GMC | K2500 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1985 | GMC | K2500 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1985 | GMC | P2500 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1984 | Chevrolet | C20 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1984 | Chevrolet | C20 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1984 | Chevrolet | G30 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1984 | Chevrolet | K20 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1984 | Chevrolet | K20 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1984 | Chevrolet | P20 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1984 | GMC | C2500 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1984 | GMC | C2500 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1984 | GMC | G3500 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1984 | GMC | K2500 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1984 | GMC | K2500 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1984 | GMC | P2500 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1983 | Chevrolet | C20 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1983 | Chevrolet | C20 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1983 | Chevrolet | G30 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1983 | Chevrolet | K20 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1983 | Chevrolet | K20 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1983 | Chevrolet | P20 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1983 | GMC | C2500 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1983 | GMC | C2500 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1983 | GMC | G3500 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1983 | GMC | K2500 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1983 | GMC | K2500 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1983 | GMC | P2500 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1982 | Chevrolet | C20 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1982 | Chevrolet | C20 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1982 | Chevrolet | K20 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1982 | Chevrolet | K20 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1982 | Chevrolet | P20 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1982 | GMC | C2500 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1982 | GMC | C2500 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1982 | GMC | K2500 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1982 | GMC | K2500 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1982 | GMC | P2500 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1981 | Chevrolet | C20 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1981 | Chevrolet | C20 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1981 | Chevrolet | K20 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1981 | Chevrolet | K20 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1981 | Chevrolet | P20 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1981 | GMC | C2500 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1981 | GMC | C2500 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1981 | GMC | K2500 | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1981 | GMC | K2500 Suburban | Rear | Fits vehicles with 9.5 inch Ring Gear |
| 1981 | GMC | P2500 | Rear | Fits vehicles with 9.5 inch 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:
1401275414047298170533747417.6601247916
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.