Hayden 391 Automatic Transmission Oil Cooler Line Connector

Transmission Oil Cooler Line Connector Kit

Hayden 391 is a steel automatic transmission oil cooler line connector kit for transmission cooler line service. This gold-finish fitting kit is performance rated and built with male inlet and outlet ends for select Jeep and Dodge applications that use 3/8" x 3/8" hose splicers or 5/8"-18 S.A.E. 45 degree fittings.

Use Hayden Cooler Inst.Kit 391 when replacing or adapting transmission cooler line connections on Jeep Cherokee, Wrangler, TJ, Grand Cherokee, and Dodge Dakota, Durango, Ram 1500, Ram 2500, Ram 3500, or Ramcharger applications. This part cross-references Four Seasons 53010 for the same application.

Key Features

• Part number: 391
• Brand line: Cooler Inst.Kit
• Automatic transmission oil cooler line connector / fitting kit
• Steel construction with gold finish
• Round connector shape
• Male inlet and male outlet
• Performance rated
• Overall height: 5.750 in; overall width: 3.875 in
• Designed for transmission cooler line service

Detailed Product Overview

Hayden 391 is a transmission fitting kit used in automatic transmission oil cooler line installations where a secure line connection is needed. The steel body and round connector design support service on vehicles that call for either 3/8" x 3/8" hose splicers or 5/8"-18 S.A.E. 45 degree fittings, depending on application. The Cooler Inst.Kit product line focuses on transmission cooling connections, making this part a direct service item for line repair and cooler plumbing work on Jeep and Dodge platforms.

Vehicle Fitment

• Fits 1997-2006 Jeep TJ, transmission line fitting kit; use on vehicles with 3/8" x 3/8" hose splicers.
• Fits 1997-2006 Jeep Wrangler, transmission line fitting kit; use on vehicles with 3/8" x 3/8" hose splicers.
• Fits 1987-1995 Jeep Wrangler, transmission line fitting kit; use on vehicles with 3/8" x 3/8" hose splicers.
• Fits 1993-2004 Jeep Grand Cherokee, transmission line fitting kit; use on vehicles with 3/8" x 3/8" hose splicers.
• Fits 2000-2003 Dodge Dakota, use on vehicles with 5/8"-18 S.A.E. 45 degree fittings.
• Fits 2000-2003 Dodge Durango, use on vehicles with 5/8"-18 S.A.E. 45 degree fittings.
• Fits 2000-2003 Dodge Ram 1500, use on vehicles with 5/8"-18 S.A.E. 45 degree fittings.
• Fits 2000-2002 Dodge Ram 2500, use on vehicles with 5/8"-18 S.A.E. 45 degree fittings.
• Fits 2000-2002 Dodge Ram 3500, use on vehicles with 5/8"-18 S.A.E. 45 degree fittings.
• Fits 2000-2001 Dodge Ramcharger, use on vehicles with 5/8"-18 S.A.E. 45 degree fittings.
• Fits 1987-2001 Jeep Cherokee, transmission line fitting kit; use on vehicles with 3/8" x 3/8" hose splicers.
• Fits 1987-1992 Jeep Comanche, transmission line fitting kit; use on vehicles with 3/8" x 3/8" hose splicers.
• Fits 1987-1990 Jeep Wagoneer, transmission line fitting kit; use on vehicles with 3/8" x 3/8" hose splicers.
• Fits 1987 Jeep J10, transmission line fitting kit; use on vehicles with 3/8" x 3/8" hose splicers.

Common Service Uses

• Replacing worn or damaged transmission cooler line fittings
• Restoring a secure connection at the transmission oil cooler line
• Adapting cooler line plumbing during transmission service
• Addressing leaks at cooler line connection points
• Supporting repair work on Jeep and Dodge transmission cooling systems

Installation Notes and Tips

Confirm the vehicle’s cooler line style before installation. This Hayden 391 fitting kit is specified for applications using 3/8" x 3/8" hose splicers or 5/8"-18 S.A.E. 45 degree fittings, and it does not include gaskets or seals. The part is supplied without a bracket and without a spring, so reuse or source any vehicle-specific sealing components as required by the application.

Quality Assurance

Hayden 391 is a performance-rated steel fitting kit built for transmission cooler line service. The gold finish adds corrosion-resistant appearance protection, and the part is listed with direct interchange coverage for select Four Seasons applications.