Corvette Shifter 6 Speed Bushing Repair Kit : C5, C6 & C7 The symptom is excessive or sloppy shift lever movement and difficulty in up shift/down shift, excessive vibration or rattling of the shift knob. Our bushings are a tighter fit so they do a much better job of managing the vibration harmonics in the shifter assembly which results in the shifter rattle. The OEM rubber bushings on the 1997-2013 Corvette manual shifter boxes often need replacement after only a few thousand miles. 4 high quality replacement rubber bushings. 2 to install + 2 more as spares. Detailed instructions