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Who told you that?
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While they may in fact be different PN and rates, the difference is really negligible. This was a debate on the Gen1s as well, and i really couldn't find actual specifics documented other than someone talked to a fox/insert shock company X and they are stiffer/etc to factor additional weight.
I added brand new screw takeoffs to replace my tired scab shocks. I thought maybe they felt stiffer, but any new shock will feel that way when replacing beat to hell 40k mi units. Any added stiffness is only a positive IMO if you plan to use the truck. Same would apply for leafs in similar fashion