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Transmission Valve Body Upgrade

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Recalibrated for Heavy-Duty Use

Advanced Hydraulic Control

A valve body upgrade recalibrates your transmission’s hydraulic control system for heavier duty use. By increasing clutch clamping force and refining shift control, it allows the transmission to handle higher torque and load without excessive slip or heat.

This upgrade delivers firmer, more predictable shifts, improved load handling, and greater confidence when towing, off-road driving, or operating under sustained demand, all while maintaining everyday drivability.

Key benefits:

  • Stronger clutch control under load
  • Firmer, more consistent shift feel
  • Improved durability and longevity
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When Factory Calibration Falls Short

THE RISKS OF HEAVY-DUTY USE ON A STOCK TRANSMISSION

Clutch Slippage

At times factory hydraulic calibration may not apply enough clamping force during heavy towing or sustained load. This can allow clutch packs to slip during gear changes, generating excessive heat and rapidly wearing friction material.

Excessive Operating Temperatures

A stock valve body can limit how effectively the cooling system and internal fluid circuits are utilised. This limits the transmission’s ability to shed heat, allowing operating temperatures to rise and increasing the risk of heat related damage.

Torque Converter Failure

Without correct balance between apply and release pressures, the torque converter clutch can slip excessively under load. Prolonged slip accelerates internal wear within the converter, increasing the likelihood of premature torque converter failure and system contamination.

The RHA Pro Solution

Reliability Is Planned, Not Left to Chance

A valve body upgrade modifies the transmission’s hydraulic control system by recalibrating oil flow and pressure delivery. This can be achieved by resizing clutch apply orifices in the valve body separator plate and revising pressure regulator and clutch control valve spring rates.

These changes increase available line pressure and clutch apply pressure, allowing clutch packs to engage faster and with greater clamping force. Reduced slip during gear changes lowers heat generation and improves torque transfer under load.
Hydraulic circuit refinements also increase internal lubrication and cooler flow rates.

Up to 40%

Higher clutch clamping forces *

Up to 60%

Quicker gear shifting *

*Results vary depending on vehicle, usage, load, and driving conditions.

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HOW THIS UPGRADE WORKS AND THE BENEFITS

Book Your Next Upgrade

Ready for Confident Towing & Touring? Make an enquiry or call us today and start planning your upgrade with your trusted 4wd specialist

Book Now

Book Your Next Upgrade

Ready to Upgrade your 4WD’s performance and reliability for towing or off-road use? Make an enquiry or call us to book your upgrade with a trusted specialist.

Book Now
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Join the vehicle Owners Who Choose Us Again and Again

Drivers return to us for honest advice, quality workmanship and clear communication. Here is what they have to say…

What Our Customers Are Saying

Had the transmission upgrade done and a external transmission cooler. Put on which Justin from Ron Hill suggested as we would be towing our caravan half way around Australia in Jan 26. Can’t recommend them enough . Service is awesome.

602+ 4.9 Star Google reviews

Had the transmission upgrade done and a external transmission cooler. Put on which Justin from Ron Hill suggested as we would be towing our caravan half way around Australia in Jan 26. Can’t recommend them enough . Service is awesome.

602+ 4.9 Star Google reviews

Had the transmission upgrade done and a external transmission cooler. Put on which Justin from Ron Hill suggested as we would be towing our caravan half way around Australia in Jan 26. Can’t recommend them enough . Service is awesome.

602+ 4.9 Star Google reviews

Had the transmission upgrade done and a external transmission cooler. Put on which Justin from Ron Hill suggested as we would be towing our caravan half way around Australia in Jan 26. Can’t recommend them enough . Service is awesome.

602+ 4.9 Star Google reviews

Had the transmission upgrade done and a external transmission cooler. Put on which Justin from Ron Hill suggested as we would be towing our caravan half way around Australia in Jan 26. Can’t recommend them enough . Service is awesome.

602+ 4.9 Star Google reviews

Had the transmission upgrade done and a external transmission cooler. Put on which Justin from Ron Hill suggested as we would be towing our caravan half way around Australia in Jan 26. Can’t recommend them enough . Service is awesome.

602+ 4.9 Star Google reviews

Had the transmission upgrade done and a external transmission cooler. Put on which Justin from Ron Hill suggested as we would be towing our caravan half way around Australia in Jan 26. Can’t recommend them enough . Service is awesome.

602+ 4.9 Star Google reviews

Had the transmission upgrade done and a external transmission cooler. Put on which Justin from Ron Hill suggested as we would be towing our caravan half way around Australia in Jan 26. Can’t recommend them enough . Service is awesome.

602+ 4.9 Star Google reviews

What Our Customers Are Saying

The Specialist Difference

Why Choose RHA For your Upgrade

RHA specialises solely in automatic transmissions, with over 50 years of dedicated experience. That focus gives us a deep understanding of how upgrades interact with each transmission design, vehicle setup, and operating conditions. The result is upgrades done properly, with reliability, performance, and longevity in mind.

Your Key Benefits

  • Clear, honest communication
  • Upfront, transparent pricing
  • Guidance you can trust
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Established leadership in the industry

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Transmission expertise under one roof
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Australians who have benefited from our services

Transmission Upgrades for Your Vehicle

Select your vehicle to see upgrade options for towing, touring, and long-term reliability.

The Ultimate 4WD Solution

What is RHA Pro?

RHA Pro is Ron Hill Automatics solution for Australia’s towing, touring, and performance 4WD owners. It’s designed to maximise your transmission’s reliability and load-handling capabilities through a range of custom, vehicle-specific upgrades.

  • Built for towing, touring, and performance 4WDs
  • Maximises your transmission’s reliability under stress
  • Increases load-handling capabilities for heavy-duty use
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ANSWERS AND INFORMATION

Frequently Asked Questions

What is the function of the valve body?

The valve body is the control centre of your automatic transmission, often referred to as the “brain” of the transmission. It directs hydraulic fluid through a network of valves and channels, determining when and how the transmission shifts gears.
No. Shifts become more decisive and controlled, not harsh. The upgrade removes excess delay and softness in factory calibration, resulting in a more connected and predictable driving feel.
Yes, it is strongly recommended. An engine tune alters torque output, which can exceed the factory transmission calibration. A valve body upgrade aligns hydraulic control with the increased torque, restoring stability and shift control.
The upgrade allows faster clutch engagement with less slip, significantly reducing heat generation under load. It also improves engine braking control, providing greater confidence on long or steep descents.
No. A valve body upgrade is a comprehensive recalibration of the hydraulic control system. Rather than generic components, the modifications are tailored to the transmission, vehicle setup, and intended use.

Do you have more questions?

Contact us and we’ll talk you through it.

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Ron Hill Automatics Sunshine Coast

Performance Automatics for Towing, Touring & 4WDs

Honest advice, upfront pricing and dependable service for the vehicles we know best

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See Transmission Upgrades

Book Your Next Upgrade

Ready for Confident Towing & Touring? Make an enquiry or call us today and start planning your upgrade with your trusted 4wd specialist

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