203F is too high mine is at 140-145f after about 75min-90min of highway driving .. pull the transmission thermostat .(thermostat delete) Why enjoy 80-100k miles of use when it can last forever...300,000 miles or 500,000 miles, a million miles?Just had the transmission replaced in this truck and opted to have them install an additional transmission cooler. I believe it is a “supercool” branded cooler but looking at the receipt from the work it is not specified.
Upon first driving it, after a 25-30 minute drive the trans temp was at 203; hotter than expected especially with the additional cooler. I have not tested it uphill yet. Upon inspection, the shop simply disconnected the factory fluid lines leading to the factory “cooler” within the radiator, and connected them to hoses leading to the new (and surprisingly fairly small) external cooler mounted in front of the AC condensor. They didn’t cap the old radiator input/output lines either.
From reading about external additional coolers here and other places, I was expecting this to be put in series with the factory cooler, presumably in series on the “output” side of the radiator connection. Is this not the preferred/superior solution? Or is what the transmission shop has done normal?
I’m just learning about transmission replacements and transmission coolers, so any input and recommendations here are appreciated - including superior external cooler examples if anyones has them.
depending on how hot it is the MAX i have seen is 165F that was when it was 110f outside most likely if it was 110f I had the a/c on MAX
the transmission thermostat is just a scam to shorten the life span of the transmission....
Just a side note: lowering the operating temp isn't a substitute for maintenance i.e changing your transmission fluid