I agree with slow. Get you a good cooler such as a b&m,fluidyne, etc off ebay (new) for 40-50 bucks. I think I paid $35 for the biggest one fluidyne makes, a few fittings and hose clamps from homedepot/lowes for 5 bucks, some of those trans cooler zip tie things, some xxx size (i used 3/8" if I rememer right) hose, and a quart or two of trans fluid for $20 max and do it yourself. Takes nothing more than a screw driver and 2 or 3 different sized wrenches at most. Hell you could even use 2 crescent wrenches.
I understand not wanting to do it yourself but theres no way in hell id pay $100 for an f350 cooler installed.