Heavy Duty Transmission Oil Cooler Kit suit Holden Colorado with 6L50 6 Speed Auto

$495.00 inc. GST $445.50 inc. GST

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


Holden Colorado Transmission Cooler

What is the best automatic transmission cooler kit? It’s one that combines durability and reliability with outstanding transmission cooling. Our Holden Colorado Transmission Cooler allows your transmission to maintain normal operating temperates 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.

Single 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 Holden Colorado
  • 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

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 Holden Colorado 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 play button below to watch the installation video


Click on the link below to open the installation instructions (full install)


Installation Instructions

Customer Reviews

Based on 35 reviews
Robert Garn

Transmission running 15 degrees cooler after cooler installation.

Thanks Robert, good to know the Cooler is helping out with your trans temps! Thanks for the review.

Russell Harrison
Fitting cooler

Cooler fitted very well easy fit only problem was the steel lower tray had to space it down a bit but otherwise ok haven’t towed to see if it works well but is definitely showing cooler on long trips

Cheers for the review Russell. Glad to hear that you're getting cooler temps. :)

Jim Sealey
Oil cooler

Very happy pretty easy to install looking forward to towing van to see how it goes,Ute running 10-15 deg cooler without towing 👍

Cheers for the 5-star review Jim. I reckon you'll continue to see good trans temp numbers when towing your van too.

Shirley Mossop
Easy installation, happy with cooler

Fitted cooler, took around 4 hours after watching video. Towing caravan before oil cooler fitted, transmission was around 95 degrees. After fitting cooler, transmission has not gone above 80 degrees. Very happy with results, recommend fitting these coolers.

Thanks for the 5-star review, Shirley. Awesome to hear the cooler has given you better trans temps!

Malcolm Connell
Auto Cooler

Have fitted it haven’t been out with the van watch this space

Thanks for the review, Malcolm. I trust you will continue to see good things when you get out with the van!