Sunsong 3602978 Power Steering Return Line End Fitting - From Gear

Power Steering Return Line End Fitting for Nissan and INFINITI

The Sunsong 3602978 power steering return line end fitting is built for direct service on a wide range of Nissan and INFINITI applications. It uses high-grade steel with a zinc electroplated finish to help resist corrosion from humidity, road salt, water, and grime.

With a straight layout and OE-style connection points, this fitting supports clean return-line service on vehicles such as the Nissan Altima, Frontier, Maxima, Pathfinder, and 370Z, along with select INFINITI models.

Key Features

• Part number 3602978
• Power steering return line end fitting
• Straight steel construction
• Zinc-coated for added rust and corrosion resistance
• End 1: 3/8 in. bubble flare
• End 2: 16 mm male O-ring
• Length: 2.5 in. (64 mm)
• Fits from-gear return tube applications on select Nissan and INFINITI vehicles

Detailed Description

Sunsong 3602978 is a steering hardware fitting engineered for return-side power steering line service. The steel tube construction and zinc plating help the part stand up to harsh underhood and underbody exposure, making it a practical choice when replacing a worn or corroded return line end fitting. This part cross-references Four Seasons 39121 for the same application.

Compatible vehicle coverage includes Fits 2002-2018 Nissan Altima, From Gear; Fits 2005-2017 Nissan Frontier, From Gear; Fits 1985-2015 Nissan Maxima, From Gear; Fits 2003-2014 Nissan Murano, From Gear; Fits 2009-2015 Nissan 370Z, From Gear; and Fits 2003-2015 INFINITI QX50/QX56/QX80 and related return-tube applications as listed in the fitment data. The 3602978 part number is also associated with service coverage across multiple Nissan and INFINITI steering return configurations.

Common Uses

• Replacing a rusted or damaged power steering return line end fitting
• Restoring a leaking connection at the steering gear return tube
• Repairing corrosion at the bubble flare or male O-ring interface
• Addressing fluid seepage at the return-side steering line connection
• Servicing return-line hardware on Nissan and INFINITI steering systems

Installation Notes and Tips

Verify the fitting style before installation: one end uses a 3/8 in. bubble flare and the other uses a 16 mm male O-ring connection. Confirm the vehicle’s steering return-line routing and match the application to the listed From Gear or Return Tube (From Gear) position. Clean mating surfaces and inspect the line for wear, deformation, or contamination before assembly.

Quality Assurance

Sunsong manufactures this tubing from high-grade steel and applies zinc electroplating to improve resistance to corrosion and rust in demanding driving conditions. The 3602978 is built to meet the dimensional and connection requirements shown in the fitment data for select Nissan and INFINITI steering return applications.