InMotion WS4950 Automatic Transmission Oil Pump Seal - Front

Automatic Transmission Oil Pump Seal for GM Applications

InMotion WS4950 is an automatic transmission oil pump seal built for front-position applications across a wide range of GM cars, trucks, vans, and SUVs. It uses polyacrylate sealing material to create a secure barrier that helps keep contaminants out and transmission fluid in.

With broad coverage for Chevrolet Silverado 1500, GMC Sierra 1500, and Chevrolet Express models, this seal is a practical choice for transmission service on many GM platforms.

Key Features

• Part number: WS4950
• Polyacrylate material for durable sealing performance
• Inside diameter: 1.748 in.
• Outside diameter: 2.627 in.
• Thickness/width: 0.33 in.
• Housing bore: 2.619 in.
• Fits front-position applications listed in the vehicle table

Detailed Description

This InMotion transmission seal is engineered to maintain a tight seal at the oil pump area, helping protect sensitive internal components from moisture and debris. The polyacrylate sealing material is selected for dependable fluid control in automatic transmission service, where accurate dimensions matter. Use WS4950 when servicing front-position applications on vehicles such as Chevrolet Silverado 1500, GMC Sierra 1500, and Chevrolet Tahoe, along with many other GM passenger and light-duty platforms.

This part cross-references common OE-style service applications for GM automatic transmissions, including 4L60-E and 4L65-E equipped vehicles where listed.

What It Helps Address

• Transmission fluid seepage at the oil pump seal area
• Contamination entering the pump and internal transmission passages
• Seal wear from age, heat, and fluid exposure
• Service issues during transmission rebuilds or reseals
• Fitment concerns on front-position GM automatic transmission applications

Installation Notes and Tips

• Confirm transmission type and vehicle notes before installation, especially on models marked with 4L60-E or 4L65-E requirements.
• Inspect the pump bore and shaft surface for wear, scoring, or corrosion before installing the new seal.
• Clean all sealing surfaces thoroughly to avoid leaks after assembly.
• Use proper installation tools to seat the seal evenly and prevent distortion.
• Verify fluid level and check for leaks after the transmission is returned to service.

Quality Assurance

InMotion manufactures this seal with precision dimensions and high-quality sealing material for consistent service performance. Part number WS4950 is built for direct-fit use in the listed applications.

• Fits 2008-2013 Chevrolet Silverado 1500, front
• Fits 1996-2014 Chevrolet Express 1500, front
• Fits 1999-2013 GMC Sierra 1500, front
• Fits 1995-2009 Chevrolet Tahoe, front
• Fits 2000-2008 Chevrolet Suburban 1500, front
• Fits 2003-2007 GMC Sierra 2500 HD, front
• Fits 1994-2002 Chevrolet Camaro, front
• Fits 1984-1993 Chevrolet Corvette, front