We ordered a Derale 15960 Hyper Cool 25-row stacked plate cooler with an electric fan. It comes with all the fittings and hose necessary to plumb the Hyper Cool cooler into your existing cooling system or to run it as a primary cooler.We ordered a Derale 15960 Hyper Cool 25-row stacked plate cooler with an electric fan. It If there has been one killer of transmissions, guilty of gearbox murder more than all other causes combined, it is definitely heat. The best ways to fight transmission heat are to lessen the load on the tranny and to add more cooling capacity. Since we're not lowering the gear ratio or lightening the truck up at all, we wanted to add some more cooling capacity to the 4L80E in this Chevy 2500 4x4. The truck was at OC Tranny getting its 80,000-mile-old transmission rebuilt, and we took the opportunity to add a bigger and better Derale Hyper Cool cooler in place of the factory auxiliary cooler that comes with the tow packages on most fullsize trucks. We chose a Hyper Cool unit because we like the electric fan option that we can wire whatever way we choose to. Since the tranny temperatures in this truck didn't ever spike unless towing heavy loads or playing off-road, we chose to wire up the fan directly to an on/off switch to use it only when needed. By replacing our factory auxiliary transmission cooler with the Hyper Cool unit, we were able to double the fluid capacity of the cooler. We also got the trick electric fan setup to pull air through the cooler.By replacing our factory auxiliary transmission cooler with the Hyper Cool unit, we were a When you buy the Hyper Cool units from Derale, the fans on the coolers are setup to pull air through the cooler. Since we were running the Derale cooler in front of the radiator, we needed to change the puller fan to a pusher fan. We did so by simply reversing the two wires out of the electric fan and turning the fan blade around.When you buy the Hyper Cool units from Derale, the fans on the coolers are setup to pull a The Hyper Cool packages come with an inline thermostat fitting and a thermostat switch to automatically turn the fan on when the fluid reaches a certain temperature. This is very simple to wire up, running a single from the thermostat switch to a hot ignition lead and another wire to the electric fan. Since the truck had absolutely no problem running cool unless it was towing or off-roading, we simply wired the fan to an on/off switch so we can turn the fan on whenever doing either of these types of driving.The Hyper Cool packages come with an inline thermostat fitting and a thermostat switch to OC Transmissions used metal strap to secure the Derale cooler in the same place the factory auxiliary cooler sat.....OC Transmissions used metal strap to secure the Derale cooler in the same place the factor ....This was definitely the most ideal spot for it to be and led to the least amount of transmission line modifications.....This was definitely the most ideal spot for it to be and led to the least amount of tr Though Derale offers bigger Hyper Cool coolers than the 15960, we stuck with this size because we were able to fit the cooler and its fan behind the grille without any cutting. Besides, the 15960 was still twice the cooler than what the factory put on the truck.Though Derale offers bigger Hyper Cool coolers than the 15960, we stuck with this size bec Sources Derale Cooling Products 3901 Medford Street Los Angeles CA 90063 323-266-3850 http://www.derale.com/ Orange County Transmissions 1375 Logan Avenue, Unit F Costa Mesa CA 92626 714-546-9900 http://orangecountytrans.com/index.html By Jerrod Jones Enjoyed this Post? Subscribe to our RSS Feed, or use your favorite social media to recommend us to friends and colleagues!