My F-350 F x 4 with 6.0 lasted about 25,000 mi and then I had the notorious death wobble. Yours probably last longer as your V-10 engine weighs less. When you replace the shocks, if you get someone to do it, look at your old shocks. Mine could be moved in and out with little effort. I replaced all five and the truck rode better than when it was new.
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