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Deep Sump Upgrade

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Protection That Goes Further

Extra Capacity Where It Counts

Installing a deep sump to your transmission gives you a larger volume of fluid to work with. More fluid means better heat control, slower fluid breakdown, and improved protection against everyday wear.

The increased capacity helps manage heat more effectively, especially under load, while also giving contaminants more fluid to disperse into. This reduces stress on internal components and supports long term transmission reliability.

  • Increases available transmission fluid capacity
  • Allows contaminants to disperse into a larger fluid volume
  • Supports longer service intervals and reliability
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The limits of standard capacity

The Drawbacks of Factory Fluid Capacity

Accelerated Fluid Breakdown

When transmission fluid is exposed to excessive heat, it degrades much faster. As the fluid breaks down, it loses its ability to lubricate and protect internal components, increasing wear and reducing overall transmission reliability.

Contaminant Buildup

With less fluid in the system, normal wear particles become concentrated more quickly. This contaminated fluid circulates through the transmission, increasing wear on sensitive internal components and accelerating overall degradation.

Rapid Temperature Rise

During towing or heavy driving, limited fluid capacity struggles to absorb heat. Temperatures rise more quickly, increasing thermal stress and pushing the transmission closer to overheating conditions.

The RHA Pro Solution

More Fluid, Lasts Longer

This upgrade replaces the factory transmission pan with a deeper, higher capacity sump designed to increase the total volume of transmission fluid in the system.

The deeper sump physically holds more fluid and increases external surface area, allowing the transmission to circulate a greater volume of oil during operation. This helps stabilise operating conditions by improving fluid availability and thermal management.

The result is a transmission system better suited to sustained load, towing, and demanding use, without altering factory drivability or control strategies.

Up to 50%

Increased fluid capacity*

Up to 40%

Improved thermal capacity*

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

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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

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 a deep sump?

A deep sump is a replacement for your transmission’s standard oil pan. It’s deeper and often has a larger surface area, allowing it to hold significantly more transmission fluid.
More fluid takes longer to heat up and provides a larger surface area for heat to dissipate. This helps maintain a more stable, lower operating temperature, especially under heavy loads.
Yes, it can. The increased fluid volume can absorb more contaminants from normal wear and tear, meaning the fluid stays effective for longer before needing replacement.
Deep sumps are not available for all transmissions. We recommend checking our vehicle-specific upgrade guide or contacting our team to see if this upgrade is available for your 4WD.
The most straightforward and cost-effective time is during a regular transmission service. It can also be easily included as part of a larger reconditioning or upgrade package.

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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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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