Hayden Automotive526 Remote Transmission Oil Cooling System

Cooler is in and working. I did initially have an issue with the fan but Amazon sent me a new one, overnight. Honestly, the problem might not have been the fan but the relay, however, I cannot confirm that. The new one works great, keeping my transmission cooler. The real test will be when I tow my camper, I will update next week.

The professional mechanic whom I asked to install this for me, he was like "wow, awesome idea" - speaking about both the bigger cooler surface, an attached fan, and (bought separately) thermostatic switch to control the fan.Unfortunately, this cooler is too big and wouldn't fit my vehicle.*IF* you're open to the idea of putting this cooler in front of your radiator (per Hayden instruction), yes it would have fit my car too. But I'm keeping that space open for a front-mount intercooler that I'll be putting in later.So in the limited space where the factory stock trans fluid cooler sits, this item (Hayden 526) wouldn't fit.Highly reco folks to search/read Hayden's product guide, and get the "outer dimensions" (not just cooler core dimension), and check where on your car you plan to mount this, before buying it. Note this is not the same as the "package" dimension that some times show up on Amazon for this product listing.As it stands, I am buying a different/smaller Hayden cooler (the 677), built with the same plate/fin concept, but it does not come with integrated fan.And then separately, I'm also buying a 7" (or maybe it was 8") automotive fan, and will mount that to the smaller 677 Hayden cooler.The 677 is still DOUBLE the cooler surface area of my stock cooler. With an additional fan, it'll still accomplish what I want to do.

With most transmission coolers you get a baggie of parts, nylon tie downs, hose clamps, hose, etc. In mine only the cooler. Amazon customer service sent me a replacement but again no parts. I called Hayden and customer service and they say, "no installation parts come this this model". So you will need hose, clamps and a way to attach it (it does have brackets so you can bolt it in). You will also need a wiring harness with a relay and a thermostat to control the fan (otherwise it runs all the time the key is on). Extra costs are around $50.This is a great cooler just be ready with the extras when you start the installation process.

The install was easy. The only tough was finding a good mounting position in a Mitsubishi Montero. It's pretty crowded in the front area with the A/C condenser, electric condenser fan, factory engine oil cooler, etc. Once you figure the best mounting your transmission overheating problems are solved. I did not put the cooler in series with the radiator. I wanted to eliminate transmission heat going to the radiator. Works great

These are a bit expensive but very easy to install and they work great keeping my trans cool when towing my 17 ft trailer behind my 1/2 ton Tahoe just put in line with the factory trans cooler and radiator cooler so there are 3 now and this one with the fan built in can be wired many different ways to meet individual needs great product good quality

After starting to get a trans leak on my '94 Mazda Navajo (read: Ford Explorer) due to climbing steep grades to reach our campsite, I dropped the whole transaxle and trans assembly to replace the front seal. After replacing the front seal and installing everything back up I wanted some more preventative measures to not have to do all that work again. I removed the front guard and made a few small cuts/modifications to get it to fit in place of the old trans cooler. Mounted everything back up and currently have it wired up to a switch. I don't use a temp gauge but when I start coming up on some steeper grades will loaded up with camping gear and my motorcycle carrier loaded with my DRZ400, I just flip the switch and don't think twice about it. Have not had any more issues since installing it.

27 June 2019: Installed it to my truck(2004 Silverado 1500) two days ago to my transmission line and I’m 100% satisfied with it performance.Now I will continue monitor the fan and update the review whenever the fan fails.

First off- the vendor TruTrans always shipped fast and packed it reasonably well. I purchased my 1st Hayden 526 Oil Cooler in March 2019 for a test bench for engines. Started actually using it in October. I had less than 30 hours on it at oil temps below 180F and 40-55psi according to my gauges. Was originally cooling 10W30 oil with it but needed to go heavier with 20W50. So I needed to disconnect the hoses and completely drain my test system and also install a bypass valve while things were apart. I cut the hoses to the barb tips. Pulled 1st hose- no problem came off well as expected...pulled 2nd hose and the crimp between the barb and 1st fin opened. Tried re-crimping it with a needle nose pliers and it crumbled. So I just yanked the rest of that hose off and ordered another on December 23rd 2019- just because that would be the fastest fix and I have deadlines. TruTrans was awesome and got it to me early- about mid-day on Christmas eve. Some of the fastest shipping ever- especially this time of year. I think I will only be using brazed radiators in future builds after this experience. As a work around, I installed short hoses with extra AN6 connectors and unions so I can disconnect & service things without ever pulling hoses off barbs on the 2nd radiator. Otherwise unit was good- good fan and drops 20F with oil running through it when the fan runs.