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Heavy Duty Transmission Oil Cooler Kit to suit Isuzu D-Max MU-X with 5 Speed and 6 Speed Auto (Vehicle Build BEFORE July 2020)

$495.00 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 and MU-X Transmission Cooler (Vehicle Build BEFORE 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 and MU-X 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 1L Full Synthetic Transmission Fluid

When you are installing the transmission cooler you may want to top-up the transmission fluid.  Select the “Add 1L Full Synthetic Transmission Fluid” option from the drop-down menu to add 1L of Full Synthetic Transmission Fluid.

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 and MU-X
  • 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
  • Full DIY installation instructions

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 and MU-X 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 or Transmission Lock-Up Kits.

Click on the link below to open the installation instructions


Installation Instructions

Additional information

Weight 3.5 kg
Dimensions 54 × 33 × 15 cm


Would you like 1L Full Synthetic Transmission Fluid?

Yes, Add 1L Trans Fluid, No, Do Not Add 1L Trans Fluid

Customer Reviews

Based on 4 reviews
Michael Devine-Jones
Great bit of kit!

Great quality, easy to fit, works well (2017 Isuzu D-MAX) must have for towing.

Thanks for the review. Glad that the kit is working well for you.

Margaret Purton
As easy as it looks

The only down side of fitting this trans cooler was that it only took 45 minutes to fit, so not sure where they get the 2 hours fitting time from lol. Seriously a quality piece of gear, well made, easy to fit, everything you need is right in the box. It helps if you have a reasonable set of tools, not be a complete nuffy when it comes to mechanical repairs, but it was very aesy to fit and plumb. The instructions provided were easy to follow with big pictures, I got my 15 year old grandson to do most of the work under my's really that simple.

Dawie Erasmus
Oil cooler

Very happy with the product and installation was great.

Nathan Pickett

Transmission cooler

Hi Nathan. Thanks for a great review!
- The Wholesale Team