Hayden 679 Universal 11” Rapid-Cool Add-On Transmission Cooler to Enhance Cooling (not for direct replacement of the factory unit)

Hit a deer with my yukon and needed replace my trans cooler. I was running a 30 row an fittings style with a 7"fan. This cooler was 3 days closer so I ordered it to replace my broken 30 row. Was surprised to find out it cools my 4l80e with a 24-2600 converter towing our camper better and I rarely need the fan anymore! Seems much more efficient and cheaper.

If you're looking at this cooler you are probably concerned that your transmission is getting too hot. This cooler will cool it down significantly. Here's my details.I have a 2003 Chevy Suburban 2500 with just over 100,000 miles that I recently purchased. I use it around town and tow a 4500# trailer. Recently I was towing in the Northwest hills of Connecticut and the truck's OEM transmission temp gauge showed 200 degrees, which is the highest I had seen. It usually runs around 140 when the temps are below 70 and progressively higher when the outside temperature is greater. The weather has been around 90 for a few week and I see temps of 180 or 185 without a trailer. I decide to add a cooler and seeing reviews it looked like the quality of Hayden was really good. I even called them and they were very helpful suggesting the 678. I opted of the 679 to get even more cooling.Installing posed some options. My truck came with a factory cooler about 1/3 the size or the 679 and mounted on a plastic brace that was then mounted on an aluminum cross member just behind the grille. In order to efficiently use the OEM cooler I needed a fit kit, which my local Pep Boys carries, so I went there rather than waiting for delivery and got a Hayden kit 390 as the instructions indicated. Good thing I didn't order it, because it turns out I needed a kit 393. When I went back to Pep Boy I decided the scrap the OEM cooler and buy another Hayden 679, which wouldn't need the fit kit, and mount them next to each other. The cooler I bought at Pep Boys was made in Australia and the cooler that came from Amazon was made in Korea, but the quality appeared similar to me. Fully installed, my coolant flows from the transmission to the radiator, then to a Hayden 769 and then another Hayden 679 and back to the Transmission.Yesterday it was 100 degrees and I took a long drive with no towing load but 6 passengers. Prior to the cooler I would expect to see 185 and the warmest the gauge showed was 150, but was running at 135 most of the time. I would say the two coolers reduced the temps by 40 degrees. Excellent results for an easy job.

Works good. Haven't hooked up a computer to see what my temps average yet but I'm sure it's better than factory trailblazer coolers.I used mine to bypass the OEM since it broke. I mounted mine with some copper straps and self tappers from home depot. Don't bother with the wierd zip tie things. Hardest part was flaring the OEM hard lines and wrangling the cooler itself into place.

2000 chevy silverado btr red hot cam 3000 stall 4l60e trans temp was 210..now down to 185 cruising 194 beating it..also have a 7in fan and bypass the radiator as the cooler in the radiator can burst and destroy your trans instantly...plus the radiator cooler raise temps..in the winter just wait till trans temp comes up before beating on it also use vovaline maxlife trans fluid thiner and better then dex..

Installation was a breeze. I just used some aluminum bar stock I had laying around along with some various nuts and bolts. I did NOT cut the factory lines like others did on their GM trucks. I saw no need to use multiple compression fittings that would create more potential leak points. The ends of the factory steel lines already had nice barb for the hose to fit over. Just loop them around like a pretzel and call it good. This is not a high pressure system so it will be fine. It doesn’t need to look nice, it just needs to be functional.I am seeing temp drops of 25-30°. On a 90° day, the transmission will not see over 160°, which it would normally be 200°.

I installed a Hayden 679 trans cooler on a 2011 Toyota 4runner SR5. a couple weeks ago I drove interstate 10 from LA California to Tuscon. The transmission reached temperatures as high as 210 d F. ambient temp was only in the 90 d F. I was not real familiar with the 4runner and read where one needs to shift into gear 4 on hills. I was testing it out for how it would react to hills. I did not like the temperatures I saw on a not so hot day. I used the locking zip ties that Hayden provided and installed it on the AC condenser through the radiator. I had to use 8 feet of hose which 4 feet was provided. It required the removal of the whole front grill and bumper of the 4runner. There is a horizontal cross member going across the condenser and I was able to install the Hayden cooler behind this. No extra room. Only thing that was questionable was how much trans fluid would be needed. I added a little more than a pint and had to remove maybe .5 pint. After installing the cooler when starting the 4runner to check fluid level the morning morning was 56 d F. I could not get the 4runner to warm up to temperature. I covered up the trans cooler and it still would not warm up. I finally idled it about 2200 rpm and it just made temp. The radiator temp was around 190 d F. I did connect the Hayden to the output of the radiator trans cooler. Hopefully this helps someone. A 2011 4runner is considered a 5th gen. I do not know if they are all made exactly the same in later years. I will now have to see how it does on a long trip. I just installed it and do not have any trip time on it. I can not comment on how it will work other than what I mention above. I do know after several years(4-5) the zip ties heat and weather deteriorate and will need replaced. It was not difficult to install, just took some time I spent about 1.5 days doing the install trying to come up with a good way to install it.