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No, factory designs/assigns ratings, not possible to change. I believe the 250 has identical parts to the 350--not much difference, if any, just rated lower for insurance purposes mostly. 10000lbs is a cutoff for class change. Much discussion on truck forums about 250/350 similiarities/part numbers.
Joe
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2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired
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