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Couldn't you use both, and have the added capacity?
You sure could but put the aftermarket cooler on the discharge of the radiator cooler. The aftermarket cooler is going to cool the fluid more then the radiator cooler will, so you do not want to send the fluid into the radiator to be heated up.


David Fritzsche
1990 Ex-Cab V-6,5-speed, with a few mods
04.5 CTD Dodge 2500 Ram--Tow Rig
Roseville, CA

"Serenity through Sobriety"