I'm installing a tranny cooler on my 1999 Tacoma EXT Cab 4x4, V6 so that I can start pulling a trailer. The directions on the Derale cooler states to locate the oil return line to tap into.
There are two lines that clearly go from the tranny to the radiator and my question is how to tell which is in and which is out? If facing the radiator, one line is on the bottom right, next to the radiator coolant line, the second is on the lower left all by itself. I suspect it is the left one, but looking to see if anyone knows for sure before I cut into it.