Trusted specialists for 50+ years on the Sunshine Coast
Call Us Today: (07) 5443 4444
Book an Upgrade

Torque Converter Lockup Control Upgrade

Make an enquiry
Book An Upgrade

Control the Biggest Heat Source

LOCK THE CONVERTER, PROTECT THE TRANSMISSION

In an automatic transmission, the torque converter generates most of the heat under load. When the converter clutch disengages, fluid slip increases rapidly, especially when towing or climbing, and that slip creates heat.

A torque converter lock-up control override gives you direct control over clutch engagement. By keeping the converter locked when conditions allow, heat is significantly reduced, engine braking is improved, the engines torque feels more direct and transmission efficiency increases.

This upgrade overrides factory programming that unlocks at the first sign of load, helping minimise slip and protect the transmission.

  • Reduced heat generation
  • Improved engine braking control
  • Increased fuel efficiency
Make an enquiry

Heat Starts at the converter

Lock-Up Control Can Prevent Transmission Failure

Overheating Under Load

Prolonged converter slip creates excessive heat when towing or driving under load, putting your transmission at risk.

Reliability & Longevity

High operating temperatures compromise reliability and longevity, accelerating internal wear and shortening transmission life.

Poor Control and Stability

Inconsistent lock-up causes gear hunting and unpredictable driveline behaviour, reducing control when towing or demanding conditions.

The RHA Pro Solution

Lock It In and Take Control

This upgrade involves fitting a dedicated torque converter lock-up control module that works alongside the factory transmission ECU. The module intercepts the ECU’s lock-up command and allows controlled override of the torque converter clutch when conditions suit.

By integrating an additional control device into the lock-up circuit, the converter clutch can remain engaged under load instead of disengaging unnecessarily. This reduces converter slip, lowers heat generation, and gives predictable control over lock-up behaviour.

Up to 90%

Reduction in heat generation with converter locked*

Up to 100%

Direct power transfer with converter locked*

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

Make an enquiry

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
602+ 4.9 Star Google reviews

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
0 + YRS

Established leadership in the industry

0 + YRS
Transmission expertise under one roof
0

Australians who have benefited from our services

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
Make an enquiry

ANSWERS AND INFORMATION

Frequently Asked Questions

What is torque converter lockup?

Lock-up is when an internal clutch engages to create a direct mechanical connection between the engine and transmission.
Yes. The controller can be disabled at any time, returning the transmission to full factory lock-up behaviour
When the converter is locked, engine braking is transferred directly to the wheels. This provides stronger, controlled deceleration on descents, reducing brake load and improving overall control when towing or carrying weight.
No. It is most beneficial for vehicles that tow, operate under heavy load, have increased engine output, or have experience elevated transmission temperatures.
Yes. In many towing and heavy-use applications, improving lock-up control reduces slip and heat, helping protect the transmission and extend service life.

Do you have more questions?

Contact us and we’ll talk you through it.

Contact Us Today

Ron Hill Automatics Sunshine Coast

Performance Automatics for Towing, Touring & 4WDs

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

Make an enquiry
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

Bookings