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I've heard about the importance of a trans cooler. I don't pull heavy loads. Just a tent trailer 4 or 5 times a summer up and down the west coast. Is a trans cooler still necessary? Change the fluid regularly, and at 104,000 miles it still performs flawlessly. Vehicle is a 4 liter '96 XLT with air shocks.
It doesn't sound like much of a load.
I pull a 26' sailboat occasionaly without a cooler and haven't experienced any problems.
The first time I was introduced to trans coolers was when I tried to pull a covered U-Haul trailer with my 68 Firebird. I couldn't get 20 miles before my engine would overheat. I tried flushing the system and it didn't help.
Once I added an external cooler I was able to cruise on the highway with no problems.
I installed a tranny cooler on my 97 Aerostar the other week (with the help of posts on this site).
Its about a foot square.
Took off front grill and bumper to get room to work in. Easy.
Mounted cooler on left hand side (when facing the front of van) in front of the condensor. Unhooked one hose from the external cooler to the new one. Ran a new hose from the new cooler to the old one.
I wanted to first go from old cooler through the new one but may have gotten flow mixed up.
Anyway, it works fine and it was an easy installation. I never had any tranny problems but want to start pulling a small Boler trailer.
I'm a firm believer in trans coolers - even if it is the factory installed one. The trans does a lot of work when you are pulling a load. I have been very luck with auto trans thru the years and I believe regular fluid / filter replacement and a coolers are the key!