Mike94XJ

I am installing a B & M transmission cooler and want to run it inline with the stock trans cooler in the radiator. Which trans cooler line into the radiator is the inlet line from the transmission the top or the bottom?

My Jeep is a 1994 Cherokee Sport 4.0 with AW-4 trans

djb383

Not positive about a '94 but probably the same as a '98 AW4, fluid from the tranny enters the bottom connector on the rad, exits the top and is returned to the tranny. So, the top line from the rad is the one u want to run to your auxiliary cooler, then back to the tranny.

To be absolutely positive about the fluid circulation, disconnect a line and run both open ends into 2 buckets, start the motor, let it run 5 seconds....one bucket will have some fluid, one won't.

On the AW4, passenger side of tranny, the front fluid line connector is fluid exiting the tranny, the rear fluid line connector is the return.

4jeepers

I may be wrong on this, but The transmission cooler is only a closed loop and it should not make any difference which way you route the lines as long as there are not any leaks!

djb383

Yes, it is a loop but, max cooling is accomplished when the auxiliary cooler is in-line with and "after" the factory rad cooler so, u need to know which way fluid is flowing in the loop.

Mike94XJ

Thanks for the help i will check by cutting one of the cooler lines because I am putting a trans temp guage in anyways so that would work great. I want to run from the trans to the radiator to cooler so that the radiator will help to heat the trans up during Michigan winters. Thanks again for the advice.

djb383

That's the way to do it and IIRC, the instructions that came with our B&M #70264 recommended to install it in-line with but after the factory rad cooler.

Be sure to post pics of your gauge install.