Hi,
I am going to change the front coils to the 5600 lb. non-plow option. I am tempted to try the 5200 lb coils but I think it is wiser to stay with those that Ford specified for base 6.7L 4X4 models.
danclem - I would shop around a bit since I don't think the front bumper needs to come off just to change the coil spring. Also I think it is possible to change the springs without a coil compressor tool since the axle can be dropped down. Here is a video example - https://www.youtube.com/watch?v=Xo3MJEomK3M
