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Along with the change in fluid I plan on installing a tranny cooler. I need to know which is the return line to the tranny? I could do the pull the line off and turn the jeep over and see if it blows fluid all over but thought I would avoid that method. My plan is to put it in seris with the line that goes through the radiator. So is it the line that is next to the pit cock (passenger side) or driver side of the radiator. This is a 99 Wrangler w/ an auto. tranny.

Thanks in advance <img src="/forums/images/graemlins/kewl.gif" alt="" />,
Carl


Keeping the tranny cooler will add life to your tranny.

I forget which line is which at the moment, but I am using a B&M Supercooler flat plate cooler on my '99 TJ.

I "think", but not 100% sure, that the return line to the trans is the one with a clamp on the rubber hose, whereas the hot or pressure line is the one fitting a wrench type fitting.

I have temp sensors on both lines and one gauge with a switch to change between hot and cool lines.

Using the radiator trans cooler and the aux cooler, I am seeing 40-60 degree drops in fluid temps.

I feel it's worth a $100 or so and a couple hours of your time to maybe extend the tranny life a few more tens of thousands of miles.