I have read a lot of posts on this board regarding this and have compared the two and found that there is no difference between the two other than the 3/4 ton version can have either 11" or 13" drums. The perches are in the exact same location between the two and the shock mounts are the same. I have looked at over 2 dozen 1 Ton Trucks and 10 times that in 3/4 ton. I've measured, and measured, and then measured some more. Does anyone have any other data to show this to be false? I know the Van version 14 is wider and needs perch and shock mount relocation but thats the exception. I've read many posts on this board saying the 1 Ton version 14FF needs the spring perches and shock mounts relocated, which is false as far as I'm concerned.