Is the speedometer electric or mechanical?

[katmol]

Is the speedometer on a 1991 Aerostar electric or mechanical? The speedometer in my 1991 AWD Aerostar shows fast. Like 5 mph over at 30 and below, and 10 mph over when you're doing 55 mph or more. It has stock size tires on it 205/75-14. What could be causing this?

Thanks.

 

[BrooklynBay]

How did you confirm this? Did you use a GPS?

 

[katmol]

Gps.

 

[BrooklynBay]

Check the color of the gear on the end of the VSS, and then check my sticky thread in the transmission section on speedometer gears. It has a color code chart to calculate the tire size with the teeth of the gear.

 

[DFW]

Curious

Check the color of the gear on the end of the VSS, and then check my sticky thread in the transmission section on speedometer gears. It has a color code chart to calculate the tire size with the teeth of the gear.

Man you really know your stuff I hope you are still around.

My 93 AeroStar has a speedo that has a needle for speed and a looks like digital for mileage.....nether are working....is the speed a cable drive?

I saw the diagrams of taking apart the cluster but just would like to know how it functions?

Thanks for any answers....

 

[BrooklynBay]

Your 93 has no cable.