Thanks for the input, Vanco. Its interesting that the Griffin radiator is 3" wide, sounds like both Griffen and AFCO radiators have the same specs. Maybe Flex-a-lite designed a good schroud to maximize their 8" fans? I'm going to have to back out of the modification if I can't get results similar to the stock set up. The van getting the AFCO is a 4x4 manual, my current rig is a 4x4 automatic. The automatic's temperature limitations, on my rig, are all about the transmission. It heats up way before the engine. All my offroad trips involve stops to let the transmission chill, in spite of after-market modifications.

Carbonized marine bilge blower idea seems like a good one. I've been thinking about removing the air conditioning components in the compartment under the passenger seat and trying to fit a blower and possibly a second battery there. Its opposite the fuel rail but at least theres some space.