The valving is different in various shock applications. Yes, the F250 will have differently valved shocks and I'm guessing different sizes, lengths, and eye ends. This is why there are thousands of different shocks out there.
I really hope that quality control has improved or at Doetsch as I ordered a set years ago and one was very different than the other 3. Customer service and trying to get a replacement was a horrible and drawn out experience with the one rep I was going through....When I finally just got a refund, They said that person was no longer there. I would be willing to try them again.
I would remove your current shocks and fully stuff and drop the axles and record the measurements from eye to eye studs. Then use this chart to determine which ones you need. Don't let a generic sales page pick your part number for you. http://doetsch-shocks.com/37.asp
Well, I ended up with the Monroes after all...
I thought I was going to be able to use my old shocks for a little while, but they turned out to be too short even for on road driving.
So between needing shocks right away, and the $60 they want for shipping on the Doetsch shock, I just decided to cheap out at Advance.
I can post the part numbers I ended up with if anybody is interested, but I just looked through all the Monroe LTs until i found the right length.
They actually feel quite a bit softer than the Superlifts I had, and it came to $68 with tax for all 4. So I'm happy enough for now.
Somewhere much later down the line I might upgrade to OME or Bilstein.
1981 CJ7, AMC 258, MC2100, T18, Dana 300, OME 2.5" lift, front locker, 32" Kenda mud terrains