National 99193 Differential Pinion Repair Sleeve - Front, Front Outer or Rear Outer

Differential Pinion Repair Sleeve for AAM Axles

National 99193 is a stainless steel differential pinion repair sleeve used to restore a worn pinion sealing surface. It is sized for a 1.937 in shaft diameter and a 2.219 in flanged outside diameter, making it a precise service part for driveline seal repair on a wide range of Jeep, Chevrolet, GMC, Cadillac, and Dodge applications.

• Stainless steel construction for corrosion resistance
• Repair sleeve design for worn pinion seal surfaces
• Shaft size: 1.937 in, with 1.934 in minimum and 1.940 in maximum
• Flanged outside diameter: 2.219 in
• Installation depth: 1.000 in
• Overall width: 0.688 in; width on shaft: 0.563 in
• National 99193 cross-references Timken KWK99193 and 66591RS

Detailed Product Overview

This differential pinion repair sleeve is built for applications where the pinion shaft sealing surface has wear, grooves, or light damage that can interfere with seal performance. National has supplied sealing solutions for more than 75 years, and this sleeve reflects that focus with a stainless steel repair surface and application-specific sizing. It is used in front outer and rear outer driveline applications, as well as select transfer case and output shaft seal applications listed in the fitment data. National 99193 is a direct replacement choice for service work on vehicles such as Jeep Wrangler, Chevrolet Silverado 1500, and GMC Sierra 1500 where the correct pinion seal surface dimensions are required.

Common Problems This Part Addresses

• Gear oil leakage at the differential pinion seal
• Grooved or worn pinion shaft sealing surface
• Seal failure after repeated service on the same shaft
• Oil seepage from front outer or rear outer axle locations
• Seal contact issues caused by shaft wear within the listed diameter range

Installation Notes and Fitment Tips

Verify shaft diameter before installation. This sleeve fits a 1.934 to 1.940 in shaft size and installs to a depth of 1.000 in. Confirm the vehicle’s axle, ring gear size, transfer case, and position before ordering, since fitment includes multiple configurations such as front outer, rear outer, and N/A transfer case applications. Fits 2003-2019 Jeep Wrangler, N/A with New Process 241OR Transfer Case, Part Time 4WD, 2 Speed; fits 1999-2018 Chevrolet Silverado 1500, front outer, with 8.25 in ring gear and AAM axle; fits 1999-2018 GMC Sierra 1500, front outer, with 8.25 in ring gear and AAM axle.

Quality Assurance

National manufactures this repair sleeve as part of its sealing and driveline service lineup, backed by more than 75 years of industry experience in premium sealing solutions. The stainless steel construction and precise dimensional specifications support consistent service fitment across the listed applications.