I got some free time this week so I worked on both my 200 series and the 120 series. I haven't seen much info on aftermarket transmission cooler install so here is my recent install/swap this week.
The reason I have oversized transmission cooler is because I tow in the mountains and my ATF temp reached 240 and 260 uphill even when I am not in overdrive. After I installed the bigger transmission cooler, my ATF temp dropped to a manageable 200 to 220 uphill. This is for both the GX and LX.
I installed a Tru-Cool Max LPD47391 transmission cooler in my GX470 about 4 years ago and that is way oversized for that vehicle. I had to mount it near the bottom which meant I was not able to install a winch. What better time to dust off some old project than during COVID. I eyeballed and then measured the LX570's stock transmission cooler and determined that it is about twice the size of the GX470's stock transmission cooler. Plus it would fit in the drive side of the GX470's grill where the original tranny cooler was. Time for a switch-a-roo. I decided to swap the Tru-Cool to the LX570 and install the stock LC200 transmission cooler to the GX470.
There is a lot of cutting and custom bracket/mounting fabrication. I used aluminum plates that I had left over from other projects because it is easy to bend and cut. Additionally, it is lightweight and rust proof.
I also had to purchase some transmission cooler lines to run the piping.
In hindsight, the Tru-Cool Max LPD47391 is too wide and I would be fine using a Tru-Cool LPD 4589 or 4590 which have smaller dimensions. It would have fit the passenger side of the LX570's grill without having to relocate the electric fan. But I made it work with what I have.
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Notes for the LX570:
There is plenty of space between the ac condenser and the front panel to fit the Tru-Cool. However, I have to remove all the stock transmission cooler ducts and relocate the electric fan. The custom aluminum brackets and mounts are created to mount the Tru-Cool tranny cooler, cooler lines (originally attached to the stock tranny cooler plastic duct), and the electric fan.
In order to mount the electric fan, I had to carefully bend the ac condenser lines a bit forward and to the driver side to create some clearance for the electric fan which is relocated about 2 inches forward. I also fabricated a base plate with two cutouts for the legs of the electric fan to sit in.
By mounting the tranny cooler high up, this provide me some space to mount a winch in the future.
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For the GX470:
There is not a lot of space between the ac condenser and the front panel. This is a common theme on the GX470, very tight working spaces... The LX570 tranny cooler covers up the entire driver side grill where the original GX470 tranny cooler and the horns are. That meant relocating the horns. Unfortunately I could not find a way to mount the electric fan in front of the tranny cooler like I did on the LX570 due to the lack of grill space.
I had to cut off most of the brackets on the stock LX570 tranny cooler to fit in the tight space on the GX470. Then I had to create some custom aluminum brackets and mounts to hold the LX570 tranny cooler.
This also provide me with space to install a winch in the future.
The stock GX470 tranny cooler is currently sitting in a box and I may put it in line with the LX570 tranny cooler if I hit high ATF temp while towing.
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Below are some photos of the tranny cooler switch-a-roo.