I wanna say TTS used to use the 3rd link for their huge trans coolers years ago. Looks familar.
For those prices might get one with a fan.
http://m.summitracing.com/parts/der-15850
I have the 15875 on the Trans and it works awesome.
cool i never followed up on it after i posted in it...I'm not sure how the derale is made on the inside. I do know if my Trans temp goes above 200 degrees after racing I can turn the fan on and it brings the temps down 30 degrees in 10 minutes. So I don't see why it wouldn't work on oil. Here is the thread
http://www.duramaxdiesels.com/forum/showthread.php?t=40649
the logged data from towing is avg ect was 189* with a max of 199* fan rarely comes on.. i understand what you are saying and agree. i believe i am far below that thresshold.
when the fan comes on and stays on for just cruising down the highway i will look at moving aux coolers to a different location, currently the fan only comes on halfway up hills if im pushing it..
Interesting. Way lower than I would have thought Adam. Can you post a pic of where your probe is?