+3 GEAR-SPEEDOMETER DRIVE-BLUE-20 TOOTH-4 SPEED-3.36 REAR-NYLON-61-81 (#54047) 01213 $29.95 In stock Quantity: 1 Add to Bag Product Details 1961-1981 CORVETTE SPEEDOMETER DRIVE GEAR - BLUE 20 TOOTH. 4 SPEED WITH 3.36 REAR DIFF. IF YOUR SPEEDOMETER READS TOO HIGH, A DRIVE GEAR WITH ONE MORE TOOTH WILL SLOW IT DOWN APPROXIMATELY 5 MILES PER HOUR. THIS NYLON GEAR MUST BE USED WITH 54054 (STEEL SPEEDOMETER DRIVE GEAR FOR 3.08 TO 3.55 REAR ENDS). SEE BELOW. GM PART NUMBER: 3987920 Save this product for later Favorite