So being a long time off roader and hot rodder. The 3.8L(NOT 3.0) Taurus/Sable fans are widely known for moving more air than even the very high performance SPAL fans.
if you have small children or let’s dont let them walk in front of your van it will suck them up.
Ford had those stupid little grills with very little opening. So they had to design a fan that would overcome that.

Mu van will freeze you out of it this July 2018 heat in Alabama so long as you’re moving 25mph it more. But sitting still it just won’t do the trick.
I believe the clutch is tired although it won’t overheat and I hear it lock in after it idles a while.
But it’s just not enough air moving.
My daughter and I race Enduros and it sits most of the time in an empty cow pasture. At last race, I had a huge homemade floor fan made from a home AC unit that would blow a tent over. I put t in front of my van to see and it cooled so much better.
So I know that cooling fan would really do the trick.
A sucker fan always works better than a pusher fan(the floor fan)

on the relay you are correct. And it actually uses a 70 amp relay. It’s a big boy calls on start up it has a 70 amp draw, then it drops a little bit of course.
I don’t have the wiring diagram. There are several ways it can be done. Most people go to pull a part. Just grab the fan, and the wiring going all the way through the relays. Then you could either do a fan controller for temperature. Or in our case we can just pin in one wire to the ECM. Then program the ECM to turn the fan off and on at any temp you choose.

When I was speaking of the clutch I was referring to the fan clutch.
I think they get a little bit tired and you start to notice it more at idol then you do anything. If I let the van idol until the temperature gets over the midpoint when I take off from a red light you can hear the fan really really roaring.
But even when it’s in full lock, at idle it’s just not moving near as much air as an electric fan would.
I think also over the course of 12 years there’s probably some bug build up in the condenser fins
i’ll make sure I clean that out really well while I’m doing this.
But man is soon as I get around 20 mph even just coasting, the wife and kids are begging me to turn the air down LOL.
Im like nope, go pound sand. It’s 100° outside, enjoy!!!

Yeah I’d say from 1998-2006 maybe
could be later
it’s a two speed fan. It’ll cool just fine on low. But it’s designed to go to high with ac too.
really just know what it looks like

Yes it’s a puller fan. I wouldn’t even try a pusher.

Yes remove the clutch fan all together. Frees up some power. Frees up some room.
its a few inches shy on side and top of a perfect fit. Either some small fan work needed or other ideas. I guess it doesn’t have to cover entire radiator perfectly. So you could probably just use the old ties through radiator.
Lots of fans do not cover whole radiator.
But my OCD will have me wondering if it could be cooling better and drive me to make it a real nice shroud setup.
My current half baked thought, not idea is to take off factory shroud. Then outdoes unit in from behind kind of lay it in there so that the fan opening on ford unit just sits inside the opening of the Chevy unit.
sort of a funnel inside a funnel deal until I zing the Chevy shroud mounting and edges to cover radiator.