Yep, that's what I meant to say. I've been looking at the Lincoln MK VIII fan. It's a 2 speed that is rumored to pull over 4000cfm in high speed mode. Going to measure my radiator when I get home to see if it will fit. I think a good e-fan on the radiator, plus a smaller 7" fan on the oil cooler wired to a toggle in the cab for additional cooling off road just might be the ticket. The Lincoln fan is reported to be 5.5" deep, but some of the shroud can be trimmed back if needed.

EDIT - Correction. The Lincoln fan is 6.15" deep, but the shroud can be trimmed down to 5.25" But from what I'm reading needs a LOT of start up current to run it. Start up voltage has been reported to be above 100A. Ouch.

The Taurus fan is reported to pull 3800cfm max and is 4.85" deep. Not sure about startup current on that one yet.