I've been looking for something like that, do the coolers from the 3500 size and bigger just bolt up? Or is there a lot of cutting and modifying required to get them to fit? I've already for a 3 row radiator, the oil cooler, and tranny cooler in the front of mine. Not sure how the spacing and size would work with swapping out the stock tranny cooler for a bigger one. I'm having my tranny rebuilt here shortly and am trying to take every precaution to make sure it lasts (including having a reputable shop do the rebuild).
I don't know the specifics, but I have seem them at the junkyard. It's a little bigger and bolts up on the passenger side in front of the radiator(same as the stock cooler on your 1500). It will have a little pusher fan in front.
If I ever put a bigger one on, it will be a huge RV trans cooler almost as big as the radiator. The 3500 isn't much of an improvement IMO. You can buy trans coolers at some auto parts stores. They will be a universal fit.
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