If you are referring to Jim Frens, that is a perfect example where the "factory" knowledge" combine with being the father of Nth Degree came into play.

 

They are referring to the stock springs. For people looking to not run a lift after adding a bumper and winch the best solution is a TJ front spring. If you want to add a budget boost after a bumper and winch, then you also would want to change the front to a TJ spring to correct for the weight.