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I’m having lettering for each front quarter panel 710 hp, Supercharged, Jack Hammer. Named Jack after Jack Roush. Not sure how they came up with hammer.

Jack Hammers were only made in 2018. Coyote engines w Roush Supercharger rated at 710hp. Only 133 approx (estimates vary) made. Basically a GT then sent to Roush Specialist dealer who adds the blower and other Roush stuff. Mine is manual though they make autos as well.

I have a new to me Jack Hammer with less than 5000 miles. Going over small bumps in the road can create a “thump” like the sound of your fist thumping on a sturdy wooden table. Has anyone else had this and what was it? Sway bars?