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.

Solved all my overheating issues! This is after riding around on a hot Louisiana day!

Works well, Good quality kit. Everything you need to install is included. I put it on a 2004 Yukon 5.3. Alot bigger than OEM unit.

Cheap cooler. Fins bend if your breathe wrong. Hoses are cheap and slit and burned up a brand new hp trans. Cost me 1500 dollars to fix under warranty. Do not buy!!

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!

Great cooler but crappy hose. Would recommend getting a stainless steel braided hose and fittings to make it more reliable. I blew the hose after one day. The fittings held but the actual hose failed.

Installed it in my 2015 silverado. Despite the bypass valve mod on thermostat, temps can still get in the 200's going up hill in a hot 90F while towing a boat at 75mph. Tested with the cooler installed and so far max temp is around 170F uphill. Flat road, it's around 150F. Without load, it's around 130F. Might disconnect it during winter. ATF may not get up to temperature during winter.For best results, install cooler after stock cooler esp if the stock cooler is part of the radiator. This will also make it easier to quickly disconnect and connect to use stock cooler. So far no leaks. Buy quality hose. The one that comes with this cooler doesn't seem that great.

anyone looking for a great cheap cooler this is the move…. i’ve been running it for a while now i have a 4l60e. stock believe it or not 300k miles. i also have a stage 3 summit cam. when my truck had the stock cooler i was seeing anywhere from 190-210 degrees. i installed this cooler. i’ve yet to see anything higher than 140 on my vcm scanner with hp tuners. also i highly recommend you get better lines unless you wanna be on the side of the road. the hose failed on me within a month. no problem tho spend the extra money order some steel braided lines you will never have a issue i’ve seen better temps with this cooler than i have with mishimoto coolers.