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National 99250 Differential Pinion Repair Sleeve - Rear Outer
| Brand | National 99250 |
|---|---|
| Position | Rear Outer |
| Flanged Outside Diameter (Inch) | 2.828 |
| Flanged Outside Diameter (MM) | 71.830 |
| Installation Depth (Inch) | 1.375 |
| Installation Depth (MM) | 34.930 |
| Material | Stainless Steel |
| Overall Width (Inch) | 0.938 |
| Overall Width (MM) | 23.830 |
| Shaft Size (Inch) | 2.503 |
| Shaft Size (MM) | 63.576 |
| Shaft Size Maximum (Inch) | 2.506 |
| Shaft Size Maximum (MM) | 63.650 |
| Shaft Size Minimum (Inch) | 2.500 |
| Shaft Size Minimum (MM) | 63.500 |
| Unit of Dimension | Inch |
| Width on Shaft (Inch) | 0.781 |
| Width on Shaft (MM) | 19.840 |
| Fits | GMC, Chevrolet, and Dodge · 13 vehicles |
Repair sleeve. Restores a worn pinion surface with a precise fit.
Stainless steel. Resists corrosion for dependable sealing performance.
National heritage. Backed by more than 75 years of sealing expertise.
Cross-references National 99250, Timken KWK99250 and 0704-7895 for the same application. See all 5.
National 99250 Differential Pinion Repair Sleeve
National 99250 is a stainless steel differential pinion repair sleeve built for rear outer applications that need a precise sealing surface. It is sized for a 2.503-inch shaft diameter and is commonly used on Spicer 80 axle setups in select Dodge Ram 2500 and Ram 3500, Chevrolet Silverado 3500, and GMC Sierra 3500 applications.
Key Features
- Stainless steel construction for a durable repair surface
- Repair sleeve design for worn or grooved pinion sealing areas
- Shaft size: 2.503 in. with a 2.500-2.506 in. range
- Flanged outside diameter: 2.828 in.
- Installation depth: 1.375 in.
- Overall width: 0.938 in.; width on shaft: 0.781 in.
- Fits rear outer positions on select 2001-2007 trucks with 11 mm ring gear and Spicer 80 axle notes
Detailed Description
This National differential pinion repair sleeve is engineered to restore the sealing area on a worn pinion shaft without changing the underlying axle housing components. The stainless steel sleeve provides a precise repair surface for applications that call for a 2.503-inch shaft size, making it a practical service part for driveline maintenance on Dodge Ram 2500 and Ram 3500, Chevrolet Silverado 3500, and GMC Sierra 3500 models. Part number 99250 is also referenced as KWK99250 and 99250RS in interchange listings.
National has focused on premium sealing solutions for decades, and this part reflects that experience with dimensions that matter during axle service: 71.830 mm flanged outside diameter, 34.930 mm installation depth, and 23.830 mm overall width. For technicians searching for a rear outer differential pinion repair sleeve for a Spicer 80 axle, National 99250 offers a direct-fit repair option for the listed applications.
What It Helps Repair
- Oil seepage at a worn pinion sealing surface
- Grooves or wear marks on the shaft where the seal rides
- Repeat seal failure caused by an uneven shaft surface
- Axle service issues on rear outer pinion locations
- Seal contact problems on 11 mm ring gear and Spicer 80 axle setups
Installation Notes and Tips
Verify shaft diameter before installation and confirm the rear outer position matches the vehicle application. This sleeve is specified for a 2.500-2.506 inch shaft range, so accurate measurement is important before pressing it into place. Clean the shaft thoroughly and inspect the sealing area for scoring or corrosion before assembly. Fits 2001-2002 Dodge Ram 2500, rear outer; fits 2001-2002 Dodge Ram 3500, rear outer; fits 2003-2006 Chevrolet Silverado 3500, rear outer; fits 2003-2006 GMC Sierra 3500, rear outer; fits 2007 GMC Sierra 3500 Classic, rear outer.
Quality Assurance
National is a long-established name in sealing components, with a product line built around precision fit and durable materials for drivetrain service. Part number 99250 is supported by established interchange references, including Timken KWK99250, for the same application.
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 2007 | GMC | Sierra 3500 Classic | Rear Outer | Fits with 11mm Ring Gear and Spicer 80 Axle |
| 2006 | Chevrolet | Silverado 3500 | Rear Outer | Fits with 11mm Ring Gear and Spicer 80 Axle |
| 2006 | GMC | Sierra 3500 | Rear Outer | Fits with 11mm Ring Gear and Spicer 80 Axle |
| 2005 | Chevrolet | Silverado 3500 | Rear Outer | Fits with 11mm Ring Gear and Spicer 80 Axle |
| 2005 | GMC | Sierra 3500 | Rear Outer | Fits with 11mm Ring Gear and Spicer 80 Axle |
| 2004 | Chevrolet | Silverado 3500 | Rear Outer | Fits with 11mm Ring Gear and Spicer 80 Axle |
| 2004 | GMC | Sierra 3500 | Rear Outer | Fits with 11mm Ring Gear and Spicer 80 Axle |
| 2003 | Chevrolet | Silverado 3500 | Rear Outer | Fits with 11mm Ring Gear and Spicer 80 Axle |
| 2003 | GMC | Sierra 3500 | Rear Outer | Fits with 11mm Ring Gear and Spicer 80 Axle |
| 2002 | Dodge | Ram 2500 | Rear Outer | Fits with 11mm Ring Gear and Spicer 80 Axle |
| 2002 | Dodge | Ram 3500 | Rear Outer | Fits with 11mm Ring Gear and Spicer 80 Axle |
| 2001 | Dodge | Ram 2500 | Rear Outer | Fits with 11mm Ring Gear and Spicer 80 Axle |
| 2001 | Dodge | Ram 3500 | Rear Outer | 2nd Design; with 11 (mm) Ring Gear; with Spicer 80 Axle |
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