Sudden odometer craziness!

[GoGoGirl]

I admit I don't pay much attention to the odometer, but I just renewed my insurance and they adjust the cost based on how much each vehicle gets used. I wrote down 68120 for the insurance company. I thought that seemed a little low. I track maintenance in a spreadsheet and sure enough, at 68630 miles is when I bought the vehicle. My receipt for new tires shows 68632 (drove from my house to a local garage, so two miles is accurate). I have driven a total of maybe 80 miles or so since then as this is my project vehicle that's partially disassembled half the time. Today I rememebered to look at the odometer when I was plowing my driveway, and it read 68140.

What the heck? Did the darn thing suddenly decide to go crazy? Is there a problem somewhere such as a kink in a cable, some kind of sensor at a wheel, etc? A quick online search shows nothing that stands out and sounds like my issue.

 

[Blue85]

The speedo and odo are purely mechanical. If the speedo is working, the cable is fine. A problem there could make the needle bounce around or everything stop working, but it can't make the odometer roll backwards. Possibly there is a gear broken in there and that one digit is able to move around. IIRC, the thousands digit will never increment until the hundreds digit rolls past 9, which means what's indicated could be way below the actual vehicle mileage. From 68632 to xxx40 implies you've driven 108 miles (or 208 and so on). Does truck have stock-sized tires and stock gears?

Or perhaps you were mistaken when you recorded some of those numbers?

 

[GoGoGirl]

Thank you.

Speedometer needle does bounce a lot, not as much as with some vintage vehicles I've driven, but I'd say about +/- 3 MPH almost constantly.

Tires are stock size and I believe it has the 3.08 (stock for the M1009) rear end.

 

[Blue85]

If the odometer is broken, the seller is required to indicate that on the title.

 

[imiceman44]

I admit I don't pay much attention to the odometer, but I just renewed my insurance and they adjust the cost based on how much each vehicle gets used. I wrote down 68120 for the insurance company. I thought that seemed a little low. I track maintenance in a spreadsheet and sure enough, at 68630 miles is when I bought the vehicle. My receipt for new tires shows 68632 (drove from my house to a local garage, so two miles is accurate). I have driven a total of maybe 80 miles or so since then as this is my project vehicle that's partially disassembled half the time. Today I rememebered to look at the odometer when I was plowing my driveway, and it read 68140.

What the heck? Did the darn thing suddenly decide to go crazy? Is there a problem somewhere such as a kink in a cable, some kind of sensor at a wheel, etc? A quick online search shows nothing that stands out and sounds like my issue.

Well for your insurance company say it was a typo you wrote 68720 which looks like 68120.
I am sure that is the correct mileage.
Now you need to figure out what is happening with the third digit.
I have a speedometer you can have for the shipping cost.

 

[GoGoGirl]

Thanks all. I do need some more time tomorrow to take a closer look and follow the cable. A guy at work reminded me that I did have the tranny rebuilt fairly recently so the cable may be disconnected or damaged.