![]() It will reduce overall operating temps of the transmission but nothing as drastic as what the OEM circuit can do (it's a well designed liquid heat exchanger with lots of surface area and heat capacity and thermal transfer).Ī good option would be something like this: Derale 9000 Series Fin and Plate Transmission Coolers 13614 The secondary cooler with be, well, secondary. When things really get warm, the OEM radiator will be the source of most of the appreciate heat transfer. Some people erroneously bypass the OEM radiator cooler which is the wrong thing to do. ![]() Note that you'll want to utilize the internal cooling circuit within the radiator - as well as the aux cooler. There are many styles with varying price points, but even a relatively inexpensive tube-and-fin style cooler can make a noticeable reduction in transmission temps. Many rigs run external coolers and they're even factory options on most rigs with tow packages. For this reason, my choice would be a factory Mopar radiator with a good plate-style external cooler. You're going to have a hard time beating OEM quality, reliability and function. I’m open to hearing what you all think and I appreciate the advice. I’ve seen other systems that mount to the body or in the wheel well, but then I question if they are truly getting enough airflow through the cooler to make a difference and it seems like there would be a risk of something hitting/damaging the cooler. Putting anything in front of the radiator is going to restrict air and may just bring up an issue with keeping my engine cool. This was my initial thought, but I’m very concerned about where to mount the cooler. Option two is to keep the OE Mopar radiator, which keeps my engine cool now, and add a separate transmission cooler. If I do go with the Griffin or any other aftermarket radiator, is it recommended to switch to an electric fan and get rid of the clutch driven fan? ![]() It is pricey, but to be honest I’m more of the belief that I would rather cough up a little more now if it saves me time, frustration and money in the long run. It seemed like the one that stood out online was made by Griffin. Option one is to go with a stand alone aftermarket radiator that has better cooling capacity for both the engine and transmission. I’m hoping people here can help me in figuring out what’s going to be best for my vehicle. He did some research and came back with a couple options. While it was in the shop I told the tech, who came highly recommended by a friend, that I was interested in adding a transmission cooler because the heat and weight have to be taking its toll on the transmission. I’ll leave the gory details of this for a second TJ tech forum post. Still trying to get an accurate diagnosis, but it is likely going to be the PCM, transmission or an electrical/exposed wire on the harness. Over the last year or so I had been considering putting in a transmission cooler in and then I had some problems last week that sent the Jeep into the shop. ![]() I really enjoy this vehicle and I plan on keeping it for the duration. I bought the Jeep with 118k miles on it and the PO had just replaced the transmission at 114k. Also, I occasionally pull a work trailer that weighs about 1,500lbs unloaded. I have aftermarket bumpers and quite a bit of underbody armor which I would say increases the vehicle weight by around 500lbs. I have 2006 4.0 LJ Rubicon with and automatic transmission, 32” tires and 150K on the odometer. This place is paradise for nine months out of the year, but the remaining three months are rough. So I live in the Phoenix area and we are just hitting our 40th consecutive day of 110+ degree weather.
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