If you're running a stock transmission cooler on a 1995-1997 truck, by all means get a larger cooler. The stock transmission cooler on an older Powerstroke is barely large enough to function as a power steering cooler. Come to think of it, the stock transmission cooler on an old Powerstroke looks just like the power steering coolers Ford used on the 70's boat cars (my ex-wife's Torino had one).
I have three coolers on my 1995 that are connected in parallel. It stays nice and cool. However, I don't worry about temperatures below 240 degrees.
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