Gagsu 40k Transmission Oil Cooler lpd47391 Compatible with tru Cool Heavy Duty 40,000 GVW Max - Low Pressure Drop Trans Cooler

I replaced the small factory tow package cooler since my temps were near 200 degrees and would go over 200 degrees pulling my boat. I flipped the bottom bracket around and used a grinder to notch it so I could mount the trans cooler to it (had to slide the cooler to the passenger side a bit to clear the mount for the PS cooler). I used a brake line cutter to cut the factory lines off horizontal, and then used a brake flare tool to slightly flare them. I doubled up on the clamps where the hose connected to the factory lines. On the cooler, I used pipe thread tape around the fittings to ensure no leaks. Pros: seems to be working good. Put about 50 miles on the truck last night on the highway going 80 MPH with the AC running. Temps never got above the halfway mark from 100 to 200 (so I'm guessing that's 150 or 160 degrees). Install took me about 2 hours in my driveway. I used everything included in the kit (had to cut the hose to fit). Cons: fins are really easy to bend. I had to use a small flat blade screwdriver to straighten some of them out after I was done mounting the cooler. Also, the included clamps are cheap. I've got a tiny drip from the return hose where it clamps to the cooler fitting. I'm going to replace that clamp with a clamp from the auto parts store tonight. My advice would be just get 2 packs of small hose clamps from your local auto parts store and use those instead of the included ones. Also that included screws will strip easily at the phillips head. I used a 10mm socket to tighten them. I snapped one off but I guess I didn't drill a large enough pilot hole for it to mount to the bracket on my 2000 Chevy Silverado Z71. I also flushed the transmission while I had the stock cooler off. I used some clear 3/8" hose and ran it into a bucket. I started the truck and while the dark old fluid was coming out I was pouring in new fluid until it was coming out red. Then I installed the cooler, added more fluid, started the truck, and kept adding fluid until it was at the proper level. I think I flushed about 3 gallons (12 quarts) through it to get the dark fluid out. I ended up buying 5 gallons of fluid total (in gallon jugs from Walmart) and I have about a half jug left after the trans was full. If you don't need to flush yours out you won't need as much fluid.

Bought a camper which we started towing with my 2004 Nissan Armada. However, when we started towing, we noticed the transmission getting hot. After researching, I realized that the factory transmission cooler is not big enough, especially for towing, so I looked into an exterior trans cooler. This one had excellent ratings, so I gave it a shot, and it has been amazing. I disconnected the stock transmission cooler, which is in the radiator and installed this external unit in its place. I am so happy I did. Our trans temp has not been elevated since we put this cooler in. It is well built and appears ready to last for the long haul. Could not be happier.

Works great, easy install. I ordered -6 a fittings and ptfe lines. I went from normal 175 cruising and 210/215 in stop and go traffic down to 170 in heavy stop and go traffic and drops immediately to 150s once you get moving again in about 80* Cali weather, car has a built LS engine with 4l80e. I did bypass the radiator completely.

Absolutely horrible item. The line they give with it is garbage. It has split 3 times and caught my vehicle on fire. I do not recommend this to anybody and if you do buy it purchase braided line with it.

Got this after seeing the test video on the Half Fixed Garage YouTube channel. The cooler was tested by itself with integrated radiator cooler bypassed. Temperature sensors before AND after the cooler. Fluid cooling of 30-40 degrees while driving and almost 50-60 degrees of cooling at stop lights. Tested in a duramax with Allison trans.

Awesome cooler and perfect fit for my 2022 Chevy Colorado ZR2 duramax. I pull a 3400lb single axle travel trailer all over the country and I used to get transmission temps of 220 on the highway and upwards of 250 when pulling up hills off road with the camper. This cooler brought the highway temps down to 190 and offroad temps down to 212. I installed the cooler BEFORE the radiator to allow the tranmssion to maintain operating temperatures. I also listened to other reviewers and ditch the hose that came with the cooler. I made all AN lines for the cooler and I have absolutely no leaks after a couple weeks of having it installed. Loving it so far!

Installed on a 2016 Chevy Silverado 1500 LS with the 6l80 transmission I just had it rebuilt and I was still seeing the transmission fluid would get as high as 210 which made me nervous I’m in Phoenix so it gets hot down here. It’s December right now and the trans temp would still get to 210, so I got this hoping it would help and it definitely does the highest I’ve seen the fluid get now is 145. It’s very easy to install only took me about an hour. I highly recommend getting a better quality hose I got 6ft of transmission line that’s rated at 400psi and used it instead. Guys the only reason it didn’t get 5 stars is because I inspected the two inputs on the cooler and I saw aluminum shavings still stuck inside one side of the cooler I’ll add photos right now so you can see but I went with a drill bit drilled them smooth and flushed out the cooler just be careful when you get you’re make sure both ports are clear of debris. Last thing you need is aluminum shavings going through your transmission. Other than that I’m pretty happy with this cooler

Bought this for my 2007 FJ Cruiser. Completely bypassed the stock cooler. Pretty much a straight forward installation, used the hardware that came with the kit. I've been hauling a 3500-3700lb trailer 2-3x a week in SoCal and was very worried about the heat being generated. I also hooked up a trans temp gauge. I don't have a reference point before but hauling 4x people and the trailer up the mountain grades in 3rd and 4th gear, top temp is 175 and cruising it settles to 115. Ambient temp is 60 degrees with the temps I listed, so I'm not worried about hauling in summer, with the 100 degree temps in SoCal.