+3 GEAR-SPEEDOMETER DRIVE-NATURAL-25 TOOTH-4.56 REAR-61-81 (#54045) 02102 $29.95 In stock Quantity: 1 Add to Bag Product Details 1961-1981 CORVETTE SPEEDOMETER DRIVE GEAR - NATURAL 25 TOOTH. FOR 4.56 REAR DIFF. IF YOUR SPEEDOMETER READ TOO HIGH, A DRIVE GEAR WITH ONE MORE TOOTH WILL SLOW IT DOWN APPROXIMATELY 5 MPH. THIS NYLON GEAR MUST BE USED WITH 54051 (STEEL SPEEDOMETER DRIVE GEAR FOR 3.70 TO 4.11 REAR ENDS). SEE BELOW. GM PART NUMBER: 3860348. Save this product for later Favorite