Trans oil cooler

Evening all. I have another question which I hope the collective knowledge-base can answer(!) - is there such a thing as an Idiot's Guide To Fitting A Transmission Oil Cooler To A '92 SVX (or similar title)? And if it is relatively simple, can any one tell me where I'd get the right bits? Incidentally, I'm unlikely to do it myself but I'd like to be reasonably sure of getting it done right!

The reason for asking is that I've had the tranny rebuilt once and as a result I'm inclined to look after it as much as possible! Also, I've noticed recently that the starter cutout seems reluctant to let me restart the engine when it's hot (eg: at a filling-station after a blast on the motorway - and, yes, it is in Park or Neutral; fiddling with the selector and ignition seems to sort it out, but it can be pretty disconcerting, to say the least! Maybe I'm barking up a red herring, but I'd like to see whether a cooler transmission helps.

Any help and advice much appreciated.