Dorman 265-903 Transmission Oil Pan

Dorman 265-903 Transmission Oil Pan

The Dorman 265-903 transmission oil pan is a direct OE-style replacement for select GM trucks and vans that need service or leak repair. Built from steel with a black E-coat finish, it adds a drain plug for cleaner fluid removal before maintenance on Chevrolet Silverado 2500 HD, GMC Sierra 3500 HD, and other listed applications.

Key Features

• Steel construction with corrosion-resistant black E-coat finish
• Convenient drain plug for easier transmission fluid service
• One-piece pan and one-piece gasket configuration
• Integrated magnet helps capture normal wear material
• Includes gasket, filter assembly, lid, drain plug, and magnet for a complete repair
• Standard replacement design for select GM and Chevrolet vehicles
• Part number 265-903 for service identification and ordering

Detailed Description

This transmission oil pan is engineered to match original equipment performance while improving serviceability. The steel pan measures 296 mm long, 477 mm wide, and 83.5 mm at maximum depth, with 18 mounting holes and a 14 mm drain thread diameter. It is designed for vehicles such as Chevrolet Express 2500, Chevrolet Silverado 3500 HD, GMC Savana 3500, and GMC Sierra 2500 HD applications listed in the fitment data. The included filter assembly, gasket, and integrated magnet support a complete transmission pan service, while the drain plug helps reduce mess during fluid changes. If you are replacing a leaking pan or performing routine maintenance, Dorman 265-903 provides a practical OE-style solution for GM transmission service.

This part cross-references GM OE 24226851 for the same application.

Common Problems This Part Can Address

• Transmission fluid leaks from a damaged or corroded pan
• Messy fluid removal during pan service
• Worn or deteriorated pan gasket sealing surfaces
• Metal debris accumulation in the transmission pan
• Service delays caused by a missing or damaged drain plug

Installation Notes and Tips

Drain the transmission fluid through the built-in plug before removing the pan to reduce spillage. Inspect the mating surface, clean the transmission case, and verify the gasket seats evenly before tightening fasteners. Confirm fitment for your exact Chevrolet Silverado 2500 HD, GMC Sierra 3500 HD, or other listed GM application before installation. Part number 265-903 should be matched to the vehicle’s transmission service requirements and mounting pattern.

Quality Assurance

Dorman OE FIX parts are built to address common service issues with an upgraded design while maintaining OE-style fit and function. The steel construction and E-coat finish add corrosion resistance for long-term service in demanding transmission applications.