03 2500hd trans cooling solution?

[Bladeboy1998]

My tranny is slipping a little, I know it's on its way out here eventually. I want to add a few coolers to the already existing one to kep it cool and try to prolong it's life. I notice it doesn't slip when it is cooler (about 150) but it touches 200 just driving. I was looking at the mishimoto electric fan one as well as a finned aluminum one (one of the 2 core jobs). I wanted to use the fined aluminum one first, then the factory one, then the mishimoto one and have its fan on a toggle switch. Is 3 coolers overkill, yes, am I going to run into problems though? I want to put the mishi on a switch becuase all the thermostats I find are for 180* and I feel that's too hot.

I figure whatever I get now I can use later when I get a new transmission to keep it cool. Any people totally against it?