Match flow and pressure
TRW's maintenance guide and a manufacturer bulletin filed with NHTSA both tie steering performance to correct pump flow and relief pressure for the gear. We don't list numbers because they differ by vehicle. Get them from the gear or vehicle maker.
What to compare
- Exact fitment: pulley, mounting, reservoir type and fittings.
- Whether your truck also runs hydraulic brake assist (hydro-boost) or a steering cooler from the same pump.
- Hoses rated for the system pressure, and the fluid type the maker specifies.
- Bleeding procedure. Air in the system causes noise and poor assist.
Questions
Will a high-flow pump fix heavy steering?
Not by itself, and too much flow or pressure for the gear can cause problems. Find the cause first, and match any pump to the gear maker's spec.
Where this comes from
- TRW: Steering system maintenance guidelines (PDF)
- Manufacturer bulletin filed with NHTSA: power steering flow and pressure specs (PDF)
- Chevrolet Canada newsroom: GM heavy-duty update with Duramax 8.3L
- The Drive: How GM is bringing heavy-duty pickup steering into the 21st century
Last reviewed 2026-10-19. General information only: your vehicle and part maker's instructions come first.