I found one control arm shaft bolt very loose and the other side gone along with its bushing. 57 2DR HTP Driver's upper control arm. Before I take off the control arm/spring, any idea why this may have happened? Under 1000 miles since all 4 (stock) control arms had new bushings installed. Passenger side is all tight. No vibration before discovered it was missing. I was tracing the wires for my 700R4 when I found them.