Dorman 800-726 Automatic Transmission Oil Cooler Line Connector

Transmission Cooler Line Connector for GM HD Trucks

This Dorman automatic transmission oil cooler line connector restores the connection between the transmission and the oil cooler on select Chevrolet Silverado and GMC Sierra heavy-duty trucks. Built from steel with a straight layout, it is made to match the fit and function of the original connector for leak-free performance.

Compatible with 2001-2007 Chevrolet Silverado 2500 HD, Silverado 3500, Silverado 2500 HD Classic, and Silverado 3500 Classic, as well as 2001-2007 GMC Sierra 2500 HD, Sierra 3500, Sierra 2500 HD Classic, and Sierra 3500 Classic with the Heavy Duty Transmission Cooling Package.

Key Features

• Steel construction for transmission cooler line service
• Straight fitting design for direct routing
• Quick disconnect end on one side for OE-style attachment
• Male thread end on the other side with 7/8-14 thread size
• Matches the original connector’s fit and function for the listed applications
• Dorman part number 800-726 for easy identification

Detailed Description

Dorman 800-726 is an automatic transmission oil cooler line connector designed for heavy-duty GM truck applications that use an oil cooler line to transmission cooler connection. The steel body and OE-style end configurations help restore a secure seal where the transmission cooler line joins the cooling circuit. This part is a direct replacement for damaged or leaking original connectors on select Chevrolet Silverado and GMC Sierra HD models.

This part cross-references 89040281 for the same application. If you are searching for a transmission oil cooler line connector for a 2001-2006 Chevrolet Silverado 2500 HD or a 2001-2006 GMC Sierra 3500, Dorman 800-726 is built for that service point.

What It Helps Fix

• Transmission fluid leaks at the oil cooler line connection
• Loose or damaged quick-disconnect fittings
• Corrosion or wear at the cooler line connector
• Poor sealing between the transmission and oil cooler line
• Service issues on GM HD trucks with the Heavy Duty Transmission Cooling Package

Installation Notes and Tips

Verify the vehicle has the Heavy Duty Transmission Cooling Package before ordering. Confirm the connector style, thread size, and line-end configuration against the original part before installation. Clean the mating surfaces and inspect the cooler line and transmission port for damage or contamination before connecting the new fitting.

Fits 2001-2006 Chevrolet Silverado 2500 HD, N/A; 2001-2006 Chevrolet Silverado 3500, N/A; 2007 Chevrolet Silverado 2500 HD Classic, N/A; 2007 Chevrolet Silverado 3500 Classic, N/A; 2001-2006 GMC Sierra 2500 HD, N/A; 2001-2006 GMC Sierra 3500, N/A; 2007 GMC Sierra 2500 HD Classic, N/A; 2007 GMC Sierra 3500 Classic, N/A.

Quality Assurance

Dorman manufactures this connector to match the original equipment fit and function for the listed GM truck applications. The steel construction and OE-style connection points are intended to restore dependable cooler line sealing at the transmission-to-oil-cooler interface.