First I have to agree with Bruce and a long list of others that this spring mod is necessary. It makes a very nice ride out of the X. It now rides like the F250 truck and handles like a dream. To all, I say thanks for making this spring swap easy.
I did V codes in the front (1.5 inch lift) and F codes in the rear. Seems that the F codes have a higher rating than the B codes. The ratings for B's are 320/670 and the F's are 334/776. This was my reason for taking the F code. The F code will give you about 0.75 inches of lift. You cannot use the helper/overload spring from the C code springs because of the AC lines running in the right rear wheel well. What I did is take the anti wrap spring from the X spring pack and used my cutting torch to make a .66 inch spacer. I then took one of the .125 inch aluminum shims also from the X spring pack and added these 2 to the F code spring pack using the X spring bolt. This gave me 3.285 inches in the thickness of the spring pack at the center spring retaining bolt which is slightly more than the original spring pack. This also increases the overall lift on the rear to about 1.5 inches.

Now on the codes.
V codes part number is 2C3Z-5310-HA. Stamped on the spring 3C34 ADA. Available from '99 to '04. Mine came from an '04 F250 and were factory pulls (lifts done by dealer on new trucks).
F codes part number is 6C3Z-5560-F. Stamped on the spring 6C34 FA. Available '06 and after. Mine came from a '07 F250 and were factory pulls (lifts done by dealer on new trucks).

There is no additional hardware needed for the front. It is a simple swap. In their service manual Ford recommends using new u-bolts all around.

For the rear I modified the F code spring pack with X spring pack parts. Other than the U-bolts all I bought was red lock tite. I figure that I use this on the front spring shackle bolts since I needed a torch to undo the factory lock tite so I felt it best to replace like for like. I used the stock X block in the rear as well.

Here are some before and after measurements taken at the plastic molding of the fender well center line with the hub of the wheel.
RF 37.125/39 1.75 rise.
Lf 37.125/39 1.75 rise.
RR 39.25/40.75 1.5 rise.
LR 39.125/40.75 1.625 rise.

The rear is still about 2 inches higher than the front and that with .75 tank of fuel.

I took this thing out for a test drive and WOW. Taking a 40 mile an hour curve at 60...WOW. It is as the X should have been from the factory.

 

Did you reuse the stock block, or did you upgrade to a bigger block?

I think everyone who does the spring swap comes to the very same conclusion.

I know I did, and I think I ended my post about the same way you did!

Stewart

 

I used the stock blocks since I added components from the X spring pack. I have only driven it about 30 miles and so far I wish I had done this long ago. To you too, thanks for your previous posts. They sure made it easy for me.

 

That's a nice rise for using stock blocks!
Stewart

PS - As my teenagers would say, thanks for the props.