transmission cooler and pan recomendations?

[steve k.]

To increase the cooling for my transmission i want to go to a larger pan. Is there any recomendation on the brand. i've looked through catalogs and all cast alluminum pans look the same with prices ranging from $90 for Summit pan to $130 for Hughes. What's the difference? Both are finned and both hold 2 extra quarts.

I also need recomendation on the transmission cooler.

The truck is a 1981 C30 used for towing a race car. Total weight of car and trailer is about 3500lb.

thanks for your advice.
steve k.