Hi mate!
Just upgrading mine whilst the front is apart...
I'm fitting a P38 Transmission cooler...
Just requires some new hoses made to suit (which removes the ones on the D2 which pop off occasionally with entertaining results.
As to your question of "need"..
Are you going to tow? If not, I'd say dont worry about it... Consider fitting a temp gauge in the oil pan and monitor the temps.... Getting too hot - just slow down or take a 5 minute crib break.
Any improvement, that helps keep ANY fluid system at optimal temperature has benefits in longevity etc.... Its a case of use vs cost vs risk.
In my case 2500kg boat will work the transmission too hard for my liking on the standard cooler. I have a Madman EMS with a sensor in my ATF so I'll be watching it anyhow!
I'd recommend going the P38 cooler.... A nice fit, and wont add hot spots in front of the Cooling system like an after market add-on.


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