13's or Mildly Broken
Join Date: Jul 2002
Location: Blair, Nebraska
Not sure if it's possible, but I'm curious as to why you would want to do it. Unless your going to put your supercharger on the 4.0, you'll be loosing power and there's a chance of loosing gas mileage. I've got a 91 3.8 T-Bird and average 20-24, depending on city and high travel - my dad has a 92 Explorer with the 4.0 and he gets 18-22, depending on travel.
I know the 4.2's fit but I'm not quite sure about the 4.0L from Explorers. It'd be interesting to see one in place of the 3.8. Again, I don't know if it's possible, just wondering why swap to a 4.0? Will you find a way to put the supercharger on from your 3.8 on the 4.0?
1994 Thunderbird SC 3.8L Supercharged
1999 Crown Victoria P71 4.6
2000 Explorer 5.0