I'm installing a spare trans cooler. And was wondering what line to tap into out of the trans top or bottom line??

 

Depends on what kind of driving you do most often. If the trans fluid does not get up to a certain temp, the trans will not up shift into OD.

Since you live in IL, you would want the fluid to flow through the auxillary cooler first, then to the heat exchanger in the radiator to warm itup a little if it needs it.

If you lived in a desert climate, you would want to plumb it into the return line, after the exchanger. Then you get some additional cooling just before it goes back into the trans.

 

Thanks the feed line is the one I have leaking so that will save some cash. Just getting it ready to head to Colorado in 2 weeks