Thread: 4HP22e cooler line pressure?

They do run high pressure, I cant recall the psi off the top of my head. Unless you run proper line, coolers and fittings then they will blow apart and drop all of the ATF. You need to run proper pressure fittings in that system. Hose clamps and flared pipe ends are not good enough.

I worked all of this out the expensive and time consuming way. As soon as I went to pressure fittings then it has been perfect ever since.

Originally Posted by Slunnie

Unless you run proper line, coolers and fittings then they will blow apart and drop all of the ATF. You need to run proper pressure fittings in that system. Hose clamps and flared pipe ends are not good enough.

My local Indie describes it perfectly: KAPOW!!! He told me this after mine did it, again. I used one of the hose mobs to repair mine. It's astonishing how quickly the trans can empty itself. And very messy. First time I left a thick trail for maybe 150 metres before FTP occurred.

Originally Posted by Tins

My local Indie describes it perfectly: KAPOW!!! He told me this after mine did it, again. I used one of the hose mobs to repair mine. It's astonishing how quickly the trans can empty itself. And very messy. First time I left a thick trail for maybe 150 metres before FTP occurred.

Absolutely, summed it up perfectly. One of the times the tranny guy (I know....) didn't even get mine out of his driveway before it dropped its ATF. This is why I'm a massive massive fan of the Davis Performance ATF cooler, because it works and is 100% reliable, unlike every other one I've tried.

Originally Posted by Slunnie

I'm a massive massive fan of the Davis Performance ATF cooler, because it works and is 100% reliable, unlike every other one I've tried.

Wish I'd known about them ten or so years ago... Overheating killed mine.

Originally Posted by Tins

Wish I'd known about them ten or so years ago... Overheating killed mine.

Totally. I did an ECU upgrade and Intercooler upgrade probably 15 years ago and it pretty much toasted the transmission which was why the additional ATF cooler. The Auto was rebuilt several times, but pretty much if the light comes on then the damage is already done. The final solution was DPL ATF Coooler and the box rebuilt (again) with ZF 4HP 3/4th gears. It has been perfect ever since. My theory with these autos is the cooler the better!

Originally Posted by Slunnie

Totally. I did an ECU upgrade and Intercooler upgrade probably 15 years ago and it pretty much toasted the transmission which was why the additional ATF cooler. The Auto was rebuilt several times, but pretty much if the light comes on then the damage is already done. The final solution was DPL ATF Coooler and the box rebuilt (again) with ZF 4HP 3/4th gears. It has been perfect ever since. My theory with these autos is the cooler the better!

Mine too. I also think they don't actually carry enough oil for the application. Fine in a Beemer on the autobahn, not so much in a nearly three tonne off roader. There isn't enough oil to cool, if you get my drift.

Thanks for the replies

I'm definitely going to be using proper hydraulic crimp fittings and weld on adaptors, I was basically just checking to see what the minimum standard would be. No way will I be trusting hose clamps etc

Cheers
Redd

Originally Posted by Reddirt204

Thanks for the replies

I'm definitely going to be using proper hydraulic crimp fittings and weld on adaptors, I was basically just checking to see what the minimum standard would be. No way will I be trusting hose clamps etc

Cheers
Redd

Wise move. I used Pirtek, but only because it was the closest. All the hydraulic hose mobs will sort it. Dearer than hose clamps, but only in the short term.

Don't do what I did and leave an O ring in the top connection of the trans. Fixing that on the side of the road was

In my defence, I fitted the thing on my back in a dirt yard in the first place, and the O ring got overlooked. Won't do that again.