I put a long Tru-Cool 4739 MAX on my 2000 F550 7.3. the 4739 is rated for 40,000#s gvw. I haul hay and run 35,000# to 45,000# gvw and the tranny temp stays well 145 to 160. With the stock cooler I could get 220 out of the tranny and it would take a long time to cool down,
I mouted the cooler in front of the ac condenser, and an electric fan is mounted in front of the cooler.
The Tru-Cool 4739 MAX I bought from Dieslesite.com for $135 after shipping, The fan i bought at Advanced Auto parts for $60
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