1970 Dave

Is there a rule of thumb guiding the process of trying to calculate the speedometer? Going up or down 1 tooth in the gear equals aproximately what change in miles per hour?

SEMPER FI--1970 Dave

SanDiegoPaul

one tooth is 3MPH

Fevre

Here is a link you might find usefull:

http://members.core.com/~faldrich/speedo.htm

zwede

You have to do percentages. If you go from a 20 to a 21 tooth driven gear the ratio is 0.952 (20/21), so the speedo will show 4.8% less. Where the speedo used to show 60 mph it will now show 57. Where it showed 100 mph it will now show 95, etc.

1970 Dave

Thanks guys --OUTSTANDING information. There truly is no end in sight, but an awful lot of satisfaction knowing 1. you have a great resource (The Corvette Forum) for advice and knowledge, and 2. getting the job done and knowing it has been done right.

SEMPER FI--1970 Dave

joe73vette

at 60mph

Joe