Large Coolers are best, the Long 'Tru Cool' brand Stacked Plate style are the most efficient. They are self regulating as well.
Long makes the B&M Coolers.
Same Co. as Makco >> http://www.transmissioncoolers.us/Merchant2/merchant.mvc?Screen=SFNT
Cooler flow diagram >> http://www.bakerprecision.com/trucool.htm
Bottom fitting on Trans to Bottom fitting on Rad,
Top fitting on Rad to Bottom fitting on Cooler,
Top fitting on Cooler to Top fitting on Trans.
Trans Case is 1/4" NPST/NationalPipeStraightThread-Male.
Jegs also has Hose kits wo/Cooler. The Cooler/Hose Combo kits don't include enough Hose to replace the Trans Lines.
I'd check with Jegs to see if the Trans fitting in the Hose Kit are 1/4" NPT or NPST. NPT can crack the Trans Case.