Do fans off a full size dodge van, actually pull more air than pickups,or is it an old wives tale. Been scoping out trans dipstick tubes to install in the rc but the last 3 I found had 904 trans. I assumed a big heavy van would have a 727 behind the 318
A van fan is the same as the bigger truck fans.
There is different types of clutches,
the non thermal ones somewhat kick in at idle, and kick out at cruising speeds. Do not even consider one of these. They can be identified by a smooth front, and lack of a thermal spring on the front.
The thermal ones are what you want, the standard one which is what you will find on 99.9% of the trucks will engage at higher temps, but still slip, and only maintain about 80% of the engine speed. They o wear out, and are hard to really tell if they do not work.
If you are going to spend any money, look at the 92 dodge 5.9 TBI fans, that are rated for severe duty. You will actually hear them kick in. They are similar to whats on the magnum trucks, with a tow package, just that they turn in the right direction for our trucks. it would be $60 well spent.
Any fan is all but useless without a shroud.