assuming speedometer works, that means the cable is ok so, yes, something not right with the odometer. You can pull it apart and see if the shaft popped out of the hole, or order a complete new speedometer (not sure you can get just the odometer part). Someone probably has an old speedo that is frozen up but the odometer pieces are fine still. I have a few but would need new numbers on the odometer. Depends on how much you want to fuss with it! american classic has them, 138 (10% off for stovebolt members

http://www.americanclassic.com/asp/...;iyear=1955&ytype=to&exyear=1959


Mike
1955 Chevy 6400 ex-flatbed (no bed now!) sold September 2023
In the Stovebolt Gallery
1958 Chevy 6400 flatbed W/dump
In the Stovebolt Gallery
1959 Chevy Suburban Owned for almost 20 years, Daily Driver -- sold May 2016
In the Stovebolt Gallery

Sufficient unto the day is the evil thereof