If it's a knocking that sounds like a womans high heels on a wooden floor, and it varies with speed, you can almost guarantee it's a fuxored rod bearing. It's usually accompnied by a burning oil smell too.
2000 SVT Turbo 295hp/269ftlb@12psi
#1 for Bendix Brakes Kits!
Knuckles rebuilt w/new bearings $55
AUSSIE ENDLINKS $70
Gutted pre-cats $80/set
A lack of planning on your part does not constitute an emergency on mine!