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Being stock springs either way, I don't see that it will make a difference. The shock height will accommodate 2" of swing in either direction, so as long as you haven't gained more than 2" the stock size is what you want. The next size up shock will spec out differently and probably for 4-6" lift. The superduty shocks might be valved sightly different because of ride comfort or how they want it to rebound/compress.
Being stock springs either way, I don't see that it will make a difference. The shock height will accommodate 2" of swing in either direction, so as long as you haven't gained more than 2" the stock size is what you want. The next size up shock will spec out differently and probably for 4-6" lift. The superduty shocks might be valved sightly different because of ride comfort or how they want it to rebound/compress.
Your logic makes sense, but the actuality is different.
Dan, when I did the spring swap, I contacted Shane at Bilstein. He recommended using the shocks for the F250 4x4 on the front of my Ex, but to stay with the Bilsteins for the 4x4 Excursion on the rear.
Shane said the fronts can use the extra length the F250 shock gives because the front V code springs raise the Ex about an inch and a half to an inch and three-quarters, but the Excursion Bilsteins for the rear are long and have a lot of travel. He said you could put a 3" lift on the Ex and still use the stock Bilstein for the rears.
Here are the part numbers for the Bilsteins if you use the V code/B code springs:
Front: BE5-2818 (OEM length for the F250 4x4)
Rear: BE5-6209 (OEM length for the Excursion 4x4)