Need Some info from people in the know!

[Ken J Martin]

Alright, here is the situation, I am trying to determine what speedometer driven gear I need to make my speedometer more accurate. I did a search and have read and looked at web sites to no end.

I have a 1972 K20, with 4:10 gears, four speed,with 285/75-16 tires. the rear tire diameter is 33 inches. the driven gear has 20 teeth. Presently the speedometer is 7 to 8 miles per hour below what my GPS provides. I am assuming I need a driven gear with less than 20 teeth.

Can anyone provide me with the information. What is there presently is a steel gear and not a nylon like found in the various catalogs.

Obliged!