Some thoughts
Just replaced my tow vehicle with a new to me 2013 Duramax RWD 3500, I had a 2006 Dodge Ram with the 5.9 Cummins, Well, the dodge bedrail sat at 55 inches tall the Duramax sits at 57 inches so what do...
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The F350's have about a 3" block between the rear leaf spring and axle that the F250 doesn't have. I suspect the 3500 GM is the same. I wonder if you could lower the rear of your new truck by removing that axle block?
