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Old 09-25-2020, 11:34 AM   #1
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Leaf springs, axles and payload capacity

How do rear leaf spring weight capacities and rear axle weight rating go together to determine payload capacity?

My 2500 truck has 5 leaf, 2600 lb. rated leaf springs and a 6000 lb. rated rear axle. Stated payload capacity is 2599 lbs.
I am thinking of upgrading to 3500 7 leaf springs with a weight rating of 3300 lbs. That is 700 lbs. more per side. Times 2, that would be a theoretical increase of 1400 lbs. Would that increase my payload by that much or some fraction of that? Or nothing at all? I know that some say that nothing done outside of the factory can increase payload but beefier springs must do something. The question is how much.


(PS - truck already has oversized wheels and tires - - - the same size that came standard on the 3500's for its year)
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Old 09-25-2020, 04:30 PM   #2
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No it doesnt change the payload rating.

Still just with the numbers you put out, the limit will be the 6000 pound axle instead of the 2600 pound springs.
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