1978 chevy 4x4 has new speedometer head and cable. old speedo was broken do replaced it. now at 20 mph on speedo it is runnning about 40 mph with follow up car at 30 35 it is running about 50 60 it is a steel gear with 20 teeth tires are 33x12.50R15 LT has a 3 '' body lift ?
Mar 4, 2013 at 6:59 PM