Precision Rebuilding Backed by Real Testing

At Turbo Kings, every THP6004A TRW Power Steering Gearbox is rebuilt with the same rigorous standards and process control that define our reputation across the diesel and heavy-duty industry. Manufactured by TRW, this gearbox is engineered for Freightliner Columbia and Century Class (2004–2016) applications, offering smooth steering response and long-term reliability under fleet workloads.

We don’t just replace worn components — we restore, validate, and certify each gearbox to meet or exceed OEM standards. Each unit is fully disassembled, media-cleaned, and carefully inspected for wear or fatigue. All seals, bearings, and internal components are replaced with premium TRW-grade parts before precision reassembly.

Once built, every gearbox is bench-tested in-house at 5 GPM and 2000 PSI, ensuring perfect hydraulic integrity, consistent internal pressure, and leak-free performance before leaving our facility.

This isn’t outsourced or guessed — it’s physically tested right here at Turbo Kings.

What Makes a Turbo Kings Rebuild Different

In-House Pressure Certification – Each TRW gearbox is validated on a closed-loop hydraulic test bench at 2000 PSI to ensure zero leaks.
Pre-Lubricated & Ready to Install – Each unit leaves our shop filled with fresh lubricant and sealed for direct installation.
Precision Machining – All mating surfaces are machined to factory-grade tolerances for perfect alignment and torque balance.
OEM-Level Components – We use only high-spec TRW seals, bearings, and shafts — never inferior aftermarket substitutes.
Hands-On Expertise – Each gearbox is rebuilt and signed off by a certified technician experienced in heavy-duty steering systems.
Comprehensive Warranty – Backed by a 12-month, unlimited-mileage warranty that reflects the confidence behind our process.

Why Fleets and Owner-Operators Trust Turbo Kings

When you choose a Turbo Kings remanufactured THP6004A TRW gearbox, you’re investing in verified reliability. Fleets, dealers, and independent mechanics rely on us because:

• We test every gearbox under real hydraulic pressure, not just on paper.

• We maintain detailed core traceability records for accountability.

• We provide direct, technician-level phone and shop support.

• We stand behind every unit with transparent communication and fast turnaround times.

Every gearbox we ship is a certified, pressure-tested product built to perform in real-world conditions.

Our Process at a Glance

Disassembly & Cleaning – Gearboxes are completely torn down, degreased, and inspected for wear, corrosion, or fatigue.
Parts Replacement & Machining – All wear components are replaced; housings are resurfaced to TRW OEM specs.
Assembly & Torque Verification – Components are torqued to precise standards and verified for alignment.
Pressure Test @ 5 GPM / 2000 PSI – Each unit is run under load to guarantee leak-free operation.
Final Inspection & Documentation – Each gearbox is serialized, logged, and paired with its warranty record.

Standard Features

• Fully Pressure-Tested at 2000 PSI and 5 GPM
• Pre-Lubricated and Ready to Install
• Leak-Free Guarantee
• 12-Month Unlimited-Mileage Warranty
• Fast Core Exchange Program

Applications

Compatible with:

• Freightliner Columbia (2004–2016)

• Freightliner Century Class

• Other heavy-duty trucks using TRW THP6004A steering systems

If you’re searching for a remanufactured THP6004A TRW Power Steering Gearbox, Freightliner Columbia steering gearbox rebuild, or TRW-certified heavy-duty steering solution, Turbo Kings delivers tested and proven reliability.

Trust Turbo Kings — We Don’t Just Rebuild, We Reign.