Hayden Automotive678 Universal Rapid-Cool 9.5” x 11” Add-On Transmission Cooler – Not for Direct Replacement of the OE Cooler

Very good quality for half the price

great. arrived installed one week no leaks

I cannot say how I truly feel about this unit seeing it has only been installed for 2 weeks, but the mechanic that installed it stated it was a good model and brand. Stated it would do the job on my 1990 Chevy Silverado 5.7L engine with 4 speed trans. The internal cooler in the radiator ruptured and got water in the trans and flat ruined it. So I NEVER want that to happen again so I decided on and external one for my truck. I trust my mechanic and believe this will keep it cool and will NOT have another episode of water in the trans. Stated it was fairly easy to install and fit on the A/C cooler using the supplied hardware. Fits snug and so far so good. If you are looking for a external trans cooler I will recommend this one as my mechanic gave it a Thumbs Up..

My daughter's car had troubles with the transmission fluid temp overheating and they did not include a cooler from the factory. I installed this one in an hour and the temp decreased by about 40 degrees farenheight immediately.

Good quality product installed on a 2011 Acura MDX. I followed the video installation guide for the MDX provided by a well-known internet trailer company but they used another manufacturer's transmission cooler. I used the Hayden because I put a Hayden on my last car and had thousands of trouble-free miles with it -- plus, it was significantly cheaper and virtually identical.Here are some notes for anyone else looking to install the Hayden 678 on a 2nd generation MDX (probably also applies to Honda Pilot but not sure):-When I installed the provided hose on the cooler hose barbs, the first one slid on effortlessly but the second was a battle, even with silicone lubricant. I fought it for about 30 minutes and still couldn't get it to seat all the way down. I ended up cutting about 3" from the hose and then it slid on perfectly. I examined the interior of the cut section and it didn't have any flaws. I can't understand why I had such trouble.-As in the video I mentioned, you can do this installation without removing the front bumper/fascia by bolting the cooler it to the existing transmission oil cooler bracket, however, the flange on the Hayden cooler is not wide enough. You will need to fabricate some metal tabs to add width to the flange.-Also as in the video, I secured the right side using one of the provided plastic "zip tie" fasteners.-You have to remove the plastic skid plate/cover from just behind the bottom of the front bumper to access the transmission lines. I also had to jack the front of the car up and put it on jackstands to get some clearance to maneuver my arms.-There is a flat, roughly triangular metal bracket right below the transmission lines that is held in with three 17mm bolts. I removed the front two and loosened the back one and pivoted the bracket out of the way. Unless you have incredibly small hands and/or a lift, I don't see how you can do this job without moving that bracket but in the video he somehow does. There is also a small hose in the way that I disconnected 2 white clips from the car frame so I can move it around a bit.-I was concerned that there wouldn't be enough hose but there was about 9" more than you actually need for the MDX. Just be very sure where you cut so you don't come up short on one end. I used a pair of anvil pruning shears and they cut it beautifully.-On my 2011 (and in the video) the return line was the line that has a canister-style filter on it about 6" from the metal barb. Confirm though by running your engine, shifting through the gears, then shut the car off and feel the two hoses. The cooler hose is the one you will tie into.-Slipping off the hoses results in transmission fluid loss. I probably spilled about 1/8 quart doing this. If you have another person with you it might help but the area to work in is so tight I can't imagine it would help much. I slipped the new hose onto the newly exposed metal barb and then connected the old hose to the other length of new hose using the flared aluminum pipe Hayden provides and 2 hose clamps. Make sure you have the hose clamps on the hoses before you do the switch. You will need an extra hose clamp as well with this installation method.-When I turned on the car to check for leaks, everything was fine except I was getting a few very tiny bubbles at one of the connections on the flared aluminum pipe. I think the hoses on the Acura are about 1/16" wider than the 11/32" hose Hayden provides. I tightened the clamp down further and the bubbles disappeared.-Remember that you MUST replace not only the transmission fluid you spilled but also you must add a little bit more as there is now more capacity due to the new cooler and hoses. I added about 200 millilitres to start and will check after driving for 15 minutes and top up as necessary. Adding transmission fluid to the MDX is a minor hassle - you either need to have a funnel with a long flexible tube to fill via the dipstick or you need to open the fill port on the transmission which requires a long socket extension and some brute strength.I hope this helps someone!

Installed on my 1974 Bronco project...Fit's well with some custom harnesses. But the size is about as big as you can get in between the grill and radiator. I would recommend.

I installed this on my 2011 Silverado Work Truck which did NOT come with a factory trans cooler. Driving with no payload, no towing, on stock 17 tires with steel wheels I would hit temps of 190 after 20 to 30 min of driving in town. Highway I would go up to 210. This is in spring/fall weather also, winter it would stay cooler.Then my trans gernaded, got to love 4L60E, and decided to install a trans cooler to keep it lasting longer.I installed this on the front center mount in front of the radiator. Using the kit as supplied and extra length hose. I also ordered the quick connect as another reviewer said to get and glad I did was very easy. It took longer to mount the cooler then it was to run the hose and hook in. I was scared as messing with the trans lines I felt like I was going to damage it.I did have to also bend the factory trans line bracket on the engine side inward for the new angle it needs to make it work. You will see when you install it just bend with some pliers after you back the nut out, then tighten up.So now I have a 4" lift, running 33's bfg KO2 and 18" wheels. I also removed the air dam under the front so I did a lot to prob not help with trans cooling.In 95 degree IL weather I hit max 170, that is stop and go driving, ac on or off, stop and go traffic or highway.Normal not hot humid day I won't get above 150 no matter how hard I drive, traffic highway.If I am on the highway or not stop and go 133 or lower is my temp.SO yes install one of these if you are like me and DON"T have a freaking oem trans cooler, thanks GM, as it will save your trans drastically.Hope this helps anybody on the fence. It was an easy install and wish I installed a trans cooler, any kind, sooner. Have a good one.

great coolers well built