SPEEDO PROBLEMS

This is most often due to problems with the vehicle speed sensor. If it's not that, it may be a problem with the gauge itself.

This is very common on the 03-06 GMs. The cause is the motors behind the gauges are failing, they all go out eventually. You can get it repaired here - www.drspeedometer.com and there's a DIY guide here - www.howtorepairmyinstrumentcluster.com

normal problem,,no fixes that really work,,mines been doing this for over 2 yrs,,got used to it