well you can pick a transmission cooler up at any autozone/pepboys place and it should be about the size of a piece of paper(i think willwren told me that one)
the easiest way to hook it up is from where the transmission lines enter the top of the radiator near the battery, just route the line from the transmission to the cooler, then back into the radiator. it'* real easy to do just make sure that you have the correct size fittings.
i just did it a couple of months back, if you got any more ?* let me know