Dual External Oil Cooler Kit to suit Isuzu D-Max with 6 Speed Auto (from July 2020)

$595.00 inc. GST $535.50 inc. GST

Bring down the transmission operating temperature to a reasonable level with one of our Heavy Duty Transmission Oil Cooler Kits



Isuzu D-Max Transmission Cooler (Vehicle Build from July 2020)

What is the best automatic transmission cooler kit? It’s one that combines durability and reliability with outstanding transmission cooling. Our Isuzu D-Max Transmission Cooler allows your transmission to maintain normal operating temperatures even while towing or going offroad and it is both durable and reliable as 4WD’ing in this country demands.

Add 2L Full Synthetic Transmission Fluid

When you are installing the transmission cooler you may want to top-up the transmission fluid.  Select the “Add 2L Full Synthetic Transmission Fluid” option from the drop-down menu to add 2L of Full Synthetic Transmission Fluid.

Dual Cooler Features in Icons

Wholesale’s transmission cooler kits are:

  • 4WD tough – Thick 3mm heavy duty steel
  • Strong single piece bracket design – For maximum rigidity even over corrugations
  • Custom designed for the Isuzu D-Max
  • Dual coated – both zinc plated and Mannex Black coated for maximum corrosion resistance
  • High efficiency crossflow transmission oil cooler
  • High temp trans cooler hose and fittings
  • DIY installation instructions

Transmission Cooler Tested on Corrugated RoadsControl Your Transmission Temperature

As the largest 4WD transmission specialist in the southern hemisphere we see many failed from other less experienced retailers. It’s one of the reasons we designed and manufactured our very own Isuzu D-Max Transmission Coolers here in Australia for Australian conditions.


  • Never install a multi-piece transmission cooler bracket or one that includes the transmission cooler as part of the bracket structure.  They are prone to fatigue and failure.
  • Never install a stainless steel transmission cooler bracket. Stainless steel induces corrosion in your aluminium cooler. Just google “stainless steel and aluminium” to find out more.

Wholesale is proud of our kits because they are Australian designed and manufactured for our tough, outback conditions. They won’t let you down.

Note! In order to get further control of your transmission temperature you can check out our Transmission Temperature Gauges.

Click on the link below to open the installation instructions


Installation Instructions

Customer Reviews

Based on 7 reviews
Daniel Noffke

Great detailed instructions. Cooler fits perfectly. They need to supply next size up hose clamps as it's to hard to slide the hose onto the barbed fittings otherwise a good DIY kit.

Thanks for the review, Daniel. I will pass on your comment about the hose clamps to our tech team.

Mitchell Casey
Trans cooler

Easy install great straight forward fitting instructions

Thanks for the 5-star review Mitchell! I also appreciate your feedback on the fitting instructions. :)

Boss Anderson
Dual Transmission oil cooler 2021 dmax

Great product, kit comes with all parts required for install, I did have to use a nut and bolt 🔩 on bottom RHS cooler bracket as there was no factory thread for the supplied M8 sems bolt to **** into 🤔. Ordered transmission oil for top up after installation which made job easier. Delivery to central Queensland 🚚 was very quick. Has given
15 to 20 *c drop in temperature 👍🏼

Robert Cartmrl

I fitted a spacer the width of an M8 nut and washer to LH bottom of bracket as was uneven on radiator support panel .
Otherwise all good thank you 👍

Thanks for the review and feedback, Robert!

Tim Young
All Easy

Easy to fit & keeps my Trans temp lower then the water temp towing my 3000kg van

Cheers Tim, great to hear you found everything easy to fit and it is making a difference to your trans temps.