It sounds like the springs rubbing/grinding against the a-arm seats. I'd pull a spring out and inspect it. I'd be willing to bet if the previous owner just cut the springs, they probably didn't throw the isolators back on or wrap the ends. Not doing this will cause the springs to rub on every little bump in the road.
It's worth a look before dropping the money on new shocks/struts that may not need to be replaced yet.
12 Black GT500 SVT PP l 2.6 Pulley/Idler l Airaid l o/r X l 305 NT555R's l Recaros l
04 Azure Blue Mach 1 / 03 Sonic Blue 3.8 / 14 Sterling Grey F150 FX4 402A 5.0 / 11 GT500 R.I.P.