I'm keen to have a crack at this - just because I can, but looking at that very nice double cooler install, I have to ask, is there the potential to over cool the ATF. It has to get up to a certain temp before the shift pattern allows you go into top doesn't it? If the sensor relies on the fluid to trigger that cycle, might you never get there unless you really work the engine hard on a mountain pass? My preference is to fit comparable cooling to original, but to remove it from the main rad. Obviously fitting a manual rad would have been nice to increase the cooling for the engine as well I'spose. Looking under the truck, I am struggling to see where I'd mount it so that it didn't fill with s**t every time I go off road. As I say, that is a nice install, but wading through mud will surely clog the fins in a heartbeat.
I could be tempted to fit the bit I salvaged from the rad like Bat did and use it as an ambient cooler to assist the main rad. After all, I am not going across the Sudan more's the pity. I reckon Sainsbury and back shouldn't jeopardise the AT that much. That little slimline rad should fit somewhere neat. Plus the additional hose provided more opportunity for heat dissipation too. Be good to connect a pump to it, push hot water through it and measure the temp at each end to see what it sheds simply with a desk fan blowing over it.
Chris
) so that the ATF can warm up quickly without going through the aux cooler and if/when additional cooling is needed, the stat opens and ATF goes through the aux cooler. 
