Aux Transmission Cooler

[backwoodsboy]

Now that the temps are a bit warmer I've noticed my trans temp creeping up while crawling through the hills in 4x4. I don't wheel the truck, mainly just towing my buddies lifted and locked samurai up to the trails.
Truck already has a 6.0 transmission cooler, which works great, except at low speeds. Also has a manual TC lockup switch which was good for a ~20 degree drop.
Got my eyes on a Derale 13700 transmission cooler with a 650cfm fan attached: Derale 13700 Derale Electra-Cool Remote Oil/Trans Cooler
Anyone have experience running one of these?
My other question is, should I use the 180* inline thermostat, or wire it up to an on/off switch? I'm thinking an on/off switch would be ideal, as a 180* temp after passing through the lines would be considerably higher in the pan.

Any input appreciated.

[Patrick Feeley]

Are you running the cooler in the radiator (as well as the 6.0)? That would help with low-speed cooling. Cheers!

[backwoodsboy]

Originally Posted by Patrick Feeley

Are you running the cooler in the radiator (as well as the 6.0)? That would help with low-speed cooling. Cheers!

Yeup, radiator to 6.0 cooler and back to trans. Flow is good, so I know neither cooler is restricted.
Thinking about running fluid to 6.0 then to fan unit, and eliminating the radiator cooler.