29 model AA gearing?

E

emmit

Junior Member
Have no tag on my rear diff. Was wondering how to tell the gearing in the truck. Cruising speed is about 20 m.p.h on the speedo. Top speed is unknown as I do not want to push the original unrebuilt 4, But 35 m.p.h. might have me looking for a new crank! Any ideas what gears I have in it?
Thanks
 
I don't know if this is sized correctly, but this chart might have the information you are looking for:
file.php
 
Also I have 7.5x20 tires on it. Would that make it slow compared to the 6.00 it is suppose to have?
Thanks
 
Get the truck on level pavement with the front wheels straight ahead. Chalk mark a rear tire at 6 o'clock. Insert the hand crank and with the truck in high gear crank the engine over till the rear tire goes one revolution. The number of engine revolutions is the final drive ratio. Removing the spark plugs makes it easier.
 
I must have 7:25 gears. Wow the truck is slow. Is finding and installing other gears a hard deal? On flat ground 3rd gear starts are easy. Really wish I had taller gears.
 
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