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

First one leaked after 5 months but the cooling capacity is amazing on these and way cheaper than name brand

After looking over all the coolers, I rolled the dice and selected this one. It is working better than expected. Still a little cool to tell. Dropped transmission temperature by 40+ degrees. 190 to 140/150 range.

Easy install, super low price!

The cooler itself seems fine. However, I made the mistake of using the included hose in a rush. I made it a little over 200 miles before the hose burst, spraying fluid all under my car. Fortunately I was paying attention and caught the issues quickly before any damage was done. Ironically this could have easily cost me a transmission.

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.

I have really heavy wheels and a 7 inch lift. This caused a lot of heat build up to my transmission with temps going past 230 with regular driving & go up to 246 with freeway driving (had hard shifts when temps reached around 210) After installing this cooler with some very aggressive driving on the freeway, temps did not exceed 164. With normal driving temps did not go past 156. The shifts were buttery smooth and the truck would go into overdrives ALOT more smoothly. I did prefill the cooler and hoses with Lucas transmission conditioner instead of using regular atf fluid.Install is so easy with the parts and tools.P.S. I bought my own hose clamps, high quality transmission hose and self drilling screws with high temp gasket maker on the threads on the cooler. & radiator adapter part number 357 (brand starts with an H)Chevy transmission temps should not exceed 190 degrees while driving normally like on road trips. Driving hard for short burst should not go over 210 (showing off) and towing heaving loads should not go over 220.I’m curious how these lower temps are gonna benefit me or not in the long run.I was told that with my heavy wheels plus lift made my truck act as if it was towing full time.

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

Best thing I have ordered for my truck I highly recommend easy to install all the hard wear it come with is perfect don’t recommend to use the hoes it come with buy better trans line from auto part store I had this cooler on my truck for 1 year and still going strong my transmission ran hot and this trans cooler kept my trans 40+ cooler