I’d have to measure to be sure probably 4 or 5 inches or so. But if your gonna go four link I would just do that instead of wasting the money and effort to swap springs first.
i used a harbor freight grinder for over 10 years. Cutting grinding built 3 cages using it to notch tube thing would get hot as **** but would never die. The only reason it got retired is because the case split apart and the tape wasn’t holding it any more.