National 99162 Automatic Transmission Pinion Repair Sleeve - Front

Automatic Transmission Pinion Repair Sleeve

National 99162 is an automatic transmission pinion repair sleeve made from stainless steel for restoring a worn shaft sealing surface. With a 1.625-inch shaft size and a flanged outside diameter of 1.875 inches, it is sized for precise repair work on select transmission applications, including Saab 900, Chevrolet Blazer, and GMC truck platforms.

Key Features

• Stainless steel construction for corrosion resistance and durable sealing-surface repair
• Repair sleeve design for worn or grooved pinion shaft areas
• 1.625-inch shaft size with a 1.623-1.628 inch shaft size range
• 0.813-inch installation depth for controlled placement
• 0.688-inch overall width and 0.563-inch width on shaft
• 1.875-inch flanged outside diameter for stable seating
• National 99162 cross-references Dorman - HELP 99162 for the same application

Product Details

Built by National, a long-standing name in sealing solutions, part number 99162 is engineered as a repair sleeve for transmission shafts that need a renewed sealing surface. The stainless steel sleeve helps address wear at the pinion area without changing the underlying shaft dimensions beyond the specified repair range. This makes it a practical service part for transmission repair on vehicles such as Chevrolet Blazer, GMC Jimmy, and Saab 900 applications listed in the fitment data.

What It Helps Fix

• Grooved or worn shaft surfaces at the transmission pinion seal area
• Seal leakage caused by surface wear on the shaft
• Repeat seal failure from an uneven sealing track
• Transmission service issues where a repair sleeve is needed to restore sealing contact

Installation Notes and Tips

Verify shaft diameter before installation; this sleeve is specified for a 1.625-inch shaft with a 1.623-1.628 inch range. Confirm the transmission application and fitment notes before service, including front-position Saab listings and the GMC CH465 and SM465-related applications shown in the fitment data. Clean the shaft thoroughly before installing National 99162 to ensure the sleeve seats evenly at the specified 0.813-inch installation depth.

Quality Assurance

National has supplied premium sealing solutions for more than 75 years and continues to develop repair components for modern and legacy vehicles. Part number 99162 reflects that focus on precise fit, material selection, and sealing performance for transmission repair work.