So I did the preliminary once-over of the engine compartment before I attempt the ATF Fluid change(102K). I plan on doing the method where I remove the return line to the tranny, let it pump till most is removed. Then fill, then repeat a couple times(at home flush job).

From front bumper back it looks as if I have 3 radiator coolers, 1 small in lower right(tranny?), 1 large behind it that is for AC, and then the engine coolant radiator.

My confusion is this......if i follow the 2 lines coming out of the tranny and running forward, one goes up to what i perceived as the engine coolant radiator?.......the other goes into the small, front most radiator(tranny cooler?)

I was always under the impression the "Radiator" was strictly for Engine Coolant, do our trucks have some sort of dual fluid radiator or am i just COMPLETELY missing something? The small tranny cooler in the front is maybe just supplemental???

From those who have been here and done this......which line should I remove for the flush? Does anyone remember which is the return line on the tranny(top or bottom line)?

Thanks for a wonderful message board......I lurk WAY more than i post but I need a hookup/lesson on this one.