cdj46

I am looking for the correct speedometer gear for my 68 427 4 speed, 3:36 stock tires. Is there a chart that will tell me color of gear and # of teeth?
Thanks
Chuck

DZRick

Follow this link then click on ( Supporting document )

http://willcoxcorvette.com/repairand...lp.php?hID=131



I guess they only list the part numbers, sorry.

cdj46

I did some more research. My car has a blue 20 tooth gear as it should be per a calculation on web site. Problem is the car reads 70 MPH when I think I am going ~40.

Billem

I have no idea if this will help, but I've found that a 1 tooth change is worth approx. 5mph. (I.E. In my case, Speedo reading = 60, actual = 65; needed to go DOWN 1 tooth less). In your case, I believe there is something else wrong 'cause a 26 tooth gear is a little unusual, but who knows? BTW, the easiest way to check the speedometer is with a GPS. Have a great day, Bill

cdj46

Thanks Bill I never thought of GPS. I will try it.
Chuck