Bedlam wrote:
Axle rating is based on the wheels offered with that model truck. The F250 came with 17" wheels and tires rated over 3000 lbs and the F350 came 18" wheels and tires over 3500 lbs. It's the same axle for the F250 and SRW F350 - It does not change until you go to the DRW F350. The difference in codes on your 2001 springs probably spec'ed it as with or without upper overload since you added your upper later.
What you are saying is true for your truck (and my new 2005). However, my old truck was a 2001, and your info is wrong. They come with 16s, and F250s and F350s were specced with different rating main packs. Different axle codes, different part numbers.
