I have a '94 XE 4X4 (my first nissan) that i just changed the (auto)trans in. I do not want to burn up the new one like the previous owner did the old one. Just have a few possibly dumb questions. What is the best tranny cooler to use (i live in Scottsdale, AZ)? Would it be best to run it solo or along with the factory one? Is it best to run a transfer case manual lock switch (that i have heard little about) or not, When is the best time to use or not use the OD OFF switch (i here some conflicting info on how it relates to the torque converter), just trying to find out what is best for the tranny. I do a fare amount of off roading, don't do much towing (dirt bikes on a small trailer is the extent of it) but a lot of freeway use. I also take the occasional trip up north where you will ascend 2500 feet in a short amount of time. Everything is stock except wheels, tires and torsion bar adjustments. Any input would be greatly appreciated.