having just had my transmission rebuilt after 71k miles, I can most assuredly tell you that a cooler is WAY cheaper than a new tranny.
Jeep insists that my towing had nothing to do with the failure that caused the rebuild, but bottom line is.. tranny got too hot
, parts burnt and failed (Or they theorize the parts failed and then the tranny got too hot due to the initial sensor failures)... total cost was close to 3k.
All I can say is thank goodness for an extended warranty and little dashboard lights
that gave me SOME warning. I can't imagine what would have happened if I was towing and it went totally kaput.
btw, I have a cooler.. the one Jeep put in at the factory.. and even that didn't help.