my speedometer 15 mph slower then gps say 55 and speedometer reads 40 350th mated to np203 transfer, 3.07 rear end gears, 31"tires, transfer gears are red 7 teeth and steel driven 20 teeth.
my GPS reads 55mph while the speedometer says 40mph, cable good drive gear is red 7 teeth driven gear is K20 teeth rear end gears are 3.07 15" tires on my k10 pickup