I just picked up a tru-cool tranny cooler 47391. I plan on installing it in a few weeks but I know they say you will lose tranny fluid when you do the swap. Once I did the swap I was going to plan to have the tranny flushed with the new dextron VI but I am wondering, how long could I drive around if the tranny is low on fluid. I don't know how much fluid would come out from the stock cooler but I was wondering if driving around on it for a few days will hurt anything. I appreciate the help.

 

Why don't you just pick up a quart or 2 before you do the install? .... TADAAA.... Put back in what you lose.. Have a plug or rag ready to put in the hole till you get it buttoned up..

 

A minimal amount of fluid is lost during the swap, I suggest doing it after letting the truck sit a few hours, even better would be overnight. The only fluid lost is from the old cooler. A quart will be more than enough to top it off.

 

This is something you should have at the house anyway if you wrench on your own vehicle!