I got a 1990 f250 4x4 7.3 idi, with a e4od that has about 15k miles on it. I also have a 1985 4x4 6.9 idi, and it has the c6 in it which is slipping in 3rd. I was thinking about swapping trans cause the 6.9 is our project/restoration and it would be nice in the road truck ya know? even though its got 3.55 rear end gears and 35s, the rpms are still a bit to high and annoying. so anyways, my question is what all comes out with the e4od and is it hard to switch it in the other truck. and is there vacuum going to it like there is the c6?