Sunsong 3401789 Power Steering Pressure Line Hose Assembly - Pump To Hydroboost

Power Steering Pressure Line Hose for OE-Style Repair

Sunsong 3401789 is a power steering pressure line hose assembly built for direct replacement on select Chevrolet, GMC, Ford, Cadillac, and Pontiac applications. It is engineered to meet demanding steering-system pressure requirements while maintaining an exact-fit layout for serviceable installation.

For 1979 Chevrolet P10, 1979 Chevrolet P20, 1979 Chevrolet P30, 1979 GMC P1500, 1979 GMC P2500, 1979 GMC P3500, 1965-1966 Ford LTD, 1964-1966 Pontiac Grand Prix, 1966 Pontiac GTO, 1963-1964 Cadillac Commercial Chassis, and 1963-1964 Cadillac DeVille applications, this hose supports pressure-side steering service where the original line has failed or is leaking.

Key Features

• Part number 3401789 power steering pressure line hose assembly
• 31 in. hose length with 5/8 in. male inverted flare end and 11/16 in. male inverted flare end
• CSM hose material for steering-system fluid resistance
• High-grade steel tubing with zinc electroplating for corrosion resistance
• Rated for up to 1,500 psi working pressure, 8,700 psi burst pressure, and 1,600 lb tensile strength
• Precision-engineered for exact fit on listed applications
• High-pressure tested before leaving the factory

Detailed Description

Sunsong 3401789 is built as a pressure hose replacement for steering systems that require durable routing and secure sealing at the fittings. The steel tubing is zinc-coated to resist rust and corrosion from humidity, road salt, water, and grime, while the CSM hose section is selected for long-term service in power steering use. This part cross-references Gates 354730 for the same application.

Use this hose when servicing a leaking or damaged pressure line on vehicles such as the Chevrolet P20, GMC P3500, Ford LTD, Pontiac GTO, or Cadillac DeVille. The exact-fit design helps restore the original hose path and connection points on the listed vehicles.

Common Problems This Part Can Address

• Power steering fluid leaks at the pressure line
• Cracked, rusted, or damaged steel tubing
• Hard steering caused by pressure loss in the line
• Noise or fluid seepage from worn hose connections
• Corrosion from road salt, moisture, or grime exposure

Installation Notes and Tips

Verify end fitting sizes before installation: 5/8 in. male inverted flare on one end and 11/16 in. male inverted flare on the other. Confirm vehicle configuration carefully, especially on 1979 Chevrolet P20 and P30 applications where hydroboost-related notes apply. This hose is listed for pump-to-hydroboost use on certain hydroboost-equipped trucks and excluded on others, so match the vehicle notes to the exact application before ordering.

Inspect the steering pump, gear, and adjacent lines for wear or contamination before installing the new hose. Clean the mating surfaces and route the line to avoid contact with heat sources or moving components.

Quality Assurance

Each Sunsong pressure hose is pressure tested before shipment to confirm factory-level integrity and consistent operation. The hose is engineered to exceed original equipment performance standards for pressure, burst resistance, and tensile strength.