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Think that is a question for the maufacturer. They claim that thier springs meet or exceed the original capacities, but they have nothing other than this claim.
What year truck do you have? Im interested in the info you need. I found a cheap kit for the 78-79 trucks and i was wondering if they will hold up a 6.9 IDI. Let us know what you find out.
im putting the 6" skyjacker springs on my 94 250 but it will be a wrok truck also.so the gvw of the spring would help.i cant find any info at all on it.