Speedometer Drive Gears

[dlfrisch]

To start with, I had my speedometer checked and re calibrated, but still N.G.

Checking the turning of my cable on the dash, it turns backing up, but it does not turn going forward - at times it will click-in and turn a couple of times. Apparently this is what is making the mph numbers jump from 0 to ?? and the back to 0.

I checked the cable, it is OK - fits (locks) into the gear drive and the speedometer. I took the gear drive off of the drive shaft and it looks OK to me ( not sure what I'm looking at though) . The gear on the drive shaft slides back and forth about 38" - 1/4" .

I don't know what to do......maybe order a new secondary take off gear unit? Does anyone have any suggestions ?
Dave