I have had, and my family has had many many auto equiped trucks over the years and all of the had the in radiator style cooler bypassed in favor of a larger afermarket one. You will find plenty of posts about cold weather operation of the 68re and people complaining about them not shifting into OD until the tranny warms up a bit but, being that it is only an option I feel pretty confident that not pre heating the fluid is ok as long as you dont load the tranny hard until the fluid warms up a bit. On the 68re and rfe the oil to coolant exchanger is an optional item in the "max tow" package, the standard setup is just the cooler in front of the rad. as far as warm up in the winter I found something interesting. I have done a lot of research on this and I'm not worried about over heating with the new cooler installed. the exchanger is there to help warm it up in the cold weather but it is also a very, very efficent cooler when things get warm. As far as warming up the transmission fluid, you are correct.partly. I am not worried about it getting to hot with the fan and added cooler installed. With the new cooler my temps are 20-30 degrees cooler on average without the fan even coming on.
I have a 6,000 lb camp trailer that I tow so I decided to add the BD Xtruded double stacked cooler with fan this weekend before I do any real towing. I installed a trans guage after I did this so I can't comment on the "before" temps but with the cooler bypassed and NOT towing anything i didnt see any temps, in the pan, that ever went over 185 ish. I simply left the transmission lines running to it alone and looped the coolant lines togeher. I was worried about the heat exchanger, or as Mopar calls it, the torque converter cooler failing and filling my ATS trans with coolant.
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