My 2004 Chevy Silverado 2500HD has just begun having a sticky odometer. Only falls to 65 mph when off. Just started on the way home tonight. Any suggestions?

These chevys are a known to have a problem with the cluster, speed sensor should have nothing to do with it sticking my 04 2500 HD has the same problem as well not all the time as well as the oil press gauge just dropping off I was told that you can have it diagnosed with a scanner not the little handheld one but a real one like snap-on Solus Mac mentor can do a gauge sweep hope this helps you out if it wasnt shifting right (slam shifting) or ABSlight was on I would look into the speed sensor I am having sensor fun myself right now I believe you have a cluster issue

I would check the connection at the back of the instrument panel. And check the connector at the Vehicle Speed Sensor. The vehicle speed sensor should be located at the rear of the trans or transfer case. This is a two wire connector.