I understand the implications of replacing the torsion bars from the ride and roll , it would however change the ride to one degree or another just by install a new one of the same part number.
I was tring to point out if the stock replacement part wasn't doing its job you could just upgrade to the better part.
I know on the 3500 series chassie you could get heavier bars when up grading to the plow package. as far as spring rates and roll characteristics it shouldn't change that much because you haven't changed the shocks and sway bars.
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