One possible cause of an erratic speedometer reading may be due to the speedometer drive gear slipping. The drive gear is not splined but is a frictional fit between the rear driveshaft bearing and output flange. If there is wear in the speedometer drive then slipping can occur. The solution is to remove the rear propshaft and re-torque the castellated nut on the rear output shaft to 85ft.lb, fit a new split pin and re-fit the propshaft.
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