The motor I'm not worried about. It'll put out enough power. The weakest link here is the transmission, which I want to make SURE I don't end up replacing prematurely.
The tranny cooler I got was a Hayden heavy duty (super duty, or whatever) cooler off of ebay for like $40 brand new. The guy has hundreds of them.
Just do a search for transmission cooler or hayden cooler.
I looked at the pics and counted the number of coils back/forth. Mine has like 11 (or 14 or something like that), it was the largest one I could find.
Mounting was pretty easy. Pulled the front end off my van (amazing that it's only held in place with 4 measly screws), ran the mounting tabs through the other radiators and mounted the tranny cooler out front.
I ran into a problem because I didn't have enough tranny cooler line. The instructions specifically state "DO NOT USE FUEL LINE", well, I went to farm & fleet and let some 17 year old moron talk me into fuel line, and trying to put it on I found that when I dipped it in hot water to soften it to get over the nipple, the hose collapsed!
$15 at my local Napa auto parts store got me some REAL transmission hose.
I didn't need to add any fluid to my van, it still measures well into the correct range. (don't know that I should over-fill it).
I ran it and checked it several times. It was a few hours of work stretched over a couple of days, but still pretty easy...
Now, I'll just have to keep an eye on the hoses to make sure they don't rub on anything or leak at the joints.