National 99435 Engine Crankshaft Repair Sleeve - Rear

Engine Crankshaft Repair Sleeve for Rear Applications

National 99435 is a stainless steel engine crankshaft repair sleeve built for rear seal repair applications. With a 4.331 inch shaft size and a 1.250 inch installation depth, it provides a precise service solution for worn sealing surfaces on select Chevrolet, GMC, and Nissan vehicles.

Key Features

• Stainless steel construction for durable crankshaft sealing surface repair
• Repair sleeve design for restoring a worn shaft area without replacing the crankshaft
• 4.331 inch shaft size with 4.327 to 4.335 inch shaft size range
• 4.921 inch flanged outside diameter for stable placement
• 0.650 inch overall width and 0.509 inch width on shaft
• Fits rear applications on a wide range of trucks, vans, and heavy-duty models
• National 99435 is also referenced as 99435RS and Timken KWK99435

Detailed Description

National 99435 is an engine crankshaft repair sleeve used to restore the sealing surface where the rear seal rides on the crankshaft. The stainless steel sleeve helps provide a consistent surface for the seal to contact, which is important when wear, grooves, or surface damage affect rear main seal performance. This part number is used across many rear-fit applications, including 1991-2000 Chevrolet C2500, K2500, and C3500; 2001-2006 Chevrolet Silverado 2500 HD and Silverado 3500; and 2016-2019 Nissan TITAN XD, Rear. It also applies to GMC Sierra, Savana, and Yukon XL models in the listed rear positions. National 99435 is a practical service part for technicians addressing crankshaft sealing wear on high-mileage engines.

This part cross-references Timken KWK99435 and 99435RS for the same application.

What It Helps Repair

• Rear main seal leakage caused by crankshaft wear
• Grooved or scored sealing surfaces on the crankshaft
• Oil seepage from a damaged seal contact area
• Repeat seal failure after prior repairs
• Service issues on rear crankshaft sealing surfaces in Chevrolet, GMC, and Nissan applications

Installation Notes and Tips

Clean the crankshaft sealing area thoroughly before installation and verify the shaft size matches the listed 4.327 to 4.335 inch range. The sleeve installs to a depth of 1.250 inches and should be positioned so the seal rides on an unworn surface. Confirm rear application fitment against the vehicle listing before service, including 1991-1999 Chevrolet P30, 1991-1999 GMC P3500, and 2016-2019 Nissan TITAN XD, Rear.

Quality Assurance

National has supplied sealing solutions for more than 75 years and continues to develop service parts for modern vehicle repair needs. Part number 99435 reflects that engineering focus with a stainless steel repair sleeve built for rear crankshaft sealing service.