When installing a 5.14 to 1 ratio axle under a truck that was formerly equipped with a 6.6 to 1 ratio axle, be sure to change both the speedometer driving and driven gears. This also applies when installing a 6.6 to 1 ratio axle under a truck formerly equipped with a 5.14 to 1 axle.

The part number of the speedometer driving gear, used with the 6.6 to 1 ratio axle, is AA- 17285-G. The driven gear is AA-17271-F.

The speedometer driving gear, used with the 5.14 to 1 ratio axle, is numbered AA-17285-F, the driven gear AA-17271-D.