Precision Rebuilding Backed by Real Testing

At Turbo Kings, every ZFLS Power Steering Gearbox that enters our facility receives the same precision rebuilding process and in-house testing that define our brand. Manufactured by ZF / Bosch, this steering gearbox is designed for Volvo heavy-duty trucks (2004–2018) and known for its reliable, responsive steering control under extreme fleet conditions.

We don’t just replace parts — we restore, validate, and certify each gearbox to perform at or above OEM specifications. Each unit is fully disassembled, media-cleaned, and inspected for wear, corrosion, or fatigue. Every critical component, from seals to bearings and shafts, is replaced with premium ZF-grade parts to ensure long-term reliability.

After reassembly, each gearbox is bench-tested in-house at 5 GPM and 2000 PSI, verifying hydraulic integrity, internal pressure balance, and zero leakage before leaving our facility.

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

What Makes a Turbo Kings Rebuild Different

In-House Pressure Certification – Every ZFLS gearbox is verified on our closed-loop hydraulic test bench at 2000 PSI to ensure zero internal or external leaks.
Pre-Lubricated & Ready to Install – Each unit leaves our shop filled with fresh lubricant and sealed for immediate installation.
Precision Machining – All housing and mating surfaces are resurfaced to factory tolerances for precise alignment and torque transfer.
OEM-Level Components – Only high-quality ZF / Bosch-spec seals, bearings, and shafts are used — never off-brand or low-grade imports.
Hands-On Expertise – Each rebuild is completed and signed off by a certified technician with extensive experience in heavy-duty steering systems.
Comprehensive Warranty – Backed by a 12-month, unlimited-mileage warranty, reflecting our confidence in every gearbox we build.

Why Fleets and Owner-Operators Trust Turbo Kings

When you choose a Turbo Kings remanufactured ZFLS Power Steering Gearbox, you’re not buying an unknown core or off-the-shelf rebuild — you’re investing in verified performance. Fleets, dealers, and independent mechanics rely on Turbo Kings because:

• Every gearbox is tested under real hydraulic pressure, not on paper.

• We maintain full traceability records for each core and component.

• We provide direct support from technicians, not call centers.

• We deliver transparent communication and fast turnaround times.

Our mission is simple: provide steering components that meet OEM precision and survive the real-world demands of the road.

Our Process at a Glance

Disassembly & Cleaning – Gearboxes are completely torn down, degreased, and inspected for any housing or component wear.
Parts Replacement & Machining – All wear items are replaced with ZF-grade components; housings are machined to spec.
Assembly & Torque Verification – Components are re-aligned, torqued, and verified for proper clearance and movement.
Pressure Test @ 5 GPM / 2000 PSI – Each gearbox undergoes a full hydraulic pressure test to ensure leak-free operation.
Final Inspection & Documentation – Every unit is serialized, logged, and linked to a warranty record for traceability.

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 Available

Applications

Compatible with:

• Volvo VNL, VNM, and VHD series (2004–2018)

• Other heavy-duty Volvo platforms equipped with ZFLS steering systems

If you’re searching for a remanufactured ZFLS Power Steering Gearbox, Volvo steering gearbox rebuild, or ZF steering gear replacement, Turbo Kings delivers proven performance backed by real testing and hands-on expertise.

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