Transmission cooler?

You can go to any parts store and buy a cooler off the shelf. They are easy to install. Find your cooler lines at the radiator. Start with a cold car. Have someone start the car, hold the brake and put it in drive. Feel which line warms up first. The line that stays cool the longest is the return line. Disconnect that one. The kit should come with a line that screws into the radiator. The stock line and the part that screwed into the radiator will have flared ends. Mount the cooler to the front of the radiator - condenser. Make sure to stay consistent in a location that the hoses will reach the return line(s). The hose will be one piece out of the box. Mount both sides to the cooler with hose clamps and route the loop of hose to the open return lines with no real sharp turns, no less than a 3 or 4 inch loop. Once you have this laid out cut the hose, put a loose hose clamp over each end, slide them on the open return lines and tighten the hose clamps. The ideal situation is for the return to go uphill so, you want the side coming out of the radiator to go to the bottom of the cooler. Make sure not to mount any cooler on the feed line that comes from the transmission into the factory cooler in the radiator. That would make the cooler pretty useless. Check for leaks and top up the transmission with Chrysler transmission fluid, ATF+4. Do not over fill. The T&C doesn't come with a dip stick. I made one for my 2010 T&C out of a generic dipstick. It's simple to measure it out to use to measure your level. If you feel uncertain about doing this job to your van let a mechanic do it. Make sure to not Route a hose so it's chaffing a sharp edge. The 3.8 should handle a pop up fine. I do think you need a cooler for that transmission.