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

Why did you pick this product vs others?:I installed this on a 2002 Chevrolet 2500 HD. I plumbed it in series with the radiator. Definitely drop the temperature on the temperature gauge. I’m pretty sure it’s running around 150 or 160°. Never gets past that and I’ve been pulling a heavy overloaded gooseneck. On a cold day, the temperature gauge barely rises. Doesn’t seem to affect my transmission shifts or anything. I may plumb it straight into the transmission by bypassing the radiator. Like I said, I’ve been pulling a trailer sometimes way overloaded. I came across the scale one time weighing about 21,000 pounds. The temperature was barely the one quarter mark on my factory gauge which I’m estimating should be about 150 or 160. Haven’t had any kind of leaks either.

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.

This cooler dropped the transmission temps down on my wife's 2011 GMC Yukon XL Denali to 140-150 degrees steady in the summer heat. Installation required a little creativity. Watch some of the videos online for installing a 40k transmission cooler and adjust as you see fit. I did try to install this cooler with the original hard lines, but could not bend them without feeling like I was about to kink the line and reduce flow, so I wound up installing the cooler with hoses that I slid over the original hard lines. I did heed the warning of the other reviews and not use the included rubber hose and bought some elsewhere. In further research I saw people recommending to install the fittings facing up, however I have not seen any evidence that this is absolutely necessary, but may do so one day.

The fins are leaking bad and I haven’t had it on for that long so I would purchase something else instead of this item.

Saved my transmission. I've burnt through through 3 transmissions pulling trailers and snow plowing.. so when I put in a rebuilt this last time I also I stalled this guy.. boy is this thing worth every single penny. Not a single degree in temp over normal operating range.

I normally dont review but this exceeded my expectations. I have 40's on my truck and it dropped temps from 200 and its not been over 140 even with hard driving. Easy install other than having to trim some plastic. Highly recommend.

My temperature went from 230 to 160, highest temperature reached was 170 hauling. Definitely used better quality hose. Fits perfect like oem.

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.