H2 external tranny cooler

Reply Subscribe

Thread Tools

Search this Thread

#11

10-16-2016, 09:04 AM

citiboy

Senior Member

Thread Starter

Join Date: Oct 2008

Location: Delson, Quebec

Posts: 286

*** Update***

Name: 14618776_10207799429040716_1775253374_o.jpg
Views: 4567
Size: 57.0 KB

#12

08-09-2017, 08:29 PM

maxxor

Junior Member

Join Date: Aug 2017

Posts: 1

Hey Citiboy. Im trying to install the same Tru-Cool Cooler on my 2004 H2, and was just wondering if you could explain exactly what I need to cut, seal-off, and which lines to reconnect to the new cooler. Ive been looking for a diagram or schematic, but so far havent had any luck.

#13

06-01-2018, 01:30 AM

Mawaleegulu

Junior Member

Join Date: Aug 2017

Posts: 9

Sorry for bringing this back from the dead. Installing this cooler this weekend just trying to get an idea where you cut the lines on the tranny hard lines to install the supplied hose. Anyone that can help i would appreciate it

#14

06-23-2018, 08:10 PM

NoSpoon

Senior Member

Join Date: Dec 2014

Location: Coastal Virginia

Posts: 114

I just did this install today, I cut one line just under the new cooler, about the midline of the truck. The other line I used an included fitting so I didn't have to cut that hard line.

I went for a test drive, it was about 90 deg. F out and the temp got up to about 125-130 max.

Citiboy or anyone else with this mod have any problems with the transmission temps being too low? I don't want to make a mistake by over cooling the transmission.

#15

06-25-2018, 12:49 PM

Mawaleegulu

Junior Member

Join Date: Aug 2017

Posts: 9

Not sure if its a coincidence but after installing the cooler and topping off the fluid a week later and about 100 miles later my trans started to slip....bad. Put a bottle of lucas stop slip and its holding up for now. But i figured i would share

#16

06-27-2018, 08:11 AM

citiboy

Senior Member

Thread Starter

Join Date: Oct 2008

Location: Delson, Quebec

Posts: 286

Quote:

Originally Posted by NoSpoon

Since i installed my cooler, i have no problem at all. I drove it in the winter and i thought i need to install a by-pass valve but the transmission fluids actually reached operating temps pretty fast (6L80e) so i never installed it. I'm very happy with the results and works great until now.

#17

07-03-2022, 12:36 PM

Mr. Hyde_H2

Junior Member

Join Date: Jun 2020

Posts: 4

Quote:

Originally Posted by citiboy

Just installed the H2 external transmission cooler and completely by-passed the radiator internal cooler. Now i don't have to worry about the coolant mixing with transmission fluids when the radiator internal cooler go.

I used this Amazon.com: Tru-Cool Max LPD47391 47391 Low Pressure Drop Transmission Oil Cooler: Automotive

Also, did this:
replaced transmission filter, transmission pan and gasket (old pan we're dented from off-roading)
completely flushed the transmission fluids with oem dexron 6 and reset transmission fluid life to 100% with Tech 2
replaced transfer case fluids with oem dexron 6
replaced front and rear differential fluids with oem 75w90 synthetic gear oil
replaced rear brake pads and parking brake shoes

Serviced front brakes
Need right rear parking brake cable, siezed, parts on order.

Road test result with the new external cooler (about 20 km distance), will update for long term use:
54*C at idle with 90*C engine temp.
65*C at 110 km/hr with 28*C outside temp

I used to run around 98*C with the stock tranny cooler.
I will see if i need to install the by-pass valve in the winter.

Attachment 11440

Attachment 11441

Attachment 11442

Attachment 11443

Attachment 11444

Hey guys,
I am about to attempt to do this. Any advice before I start? Any complications or hurdles I should be aware of? Also, I want to swap out my radiator. Any suggestions on brands?