Don I had a 04 chevy company truck and the speedometer did that and we had a rash of 03 to 05 or 06 trucks that we had to send the cluster off to be repaired. I saw a guy in the CG in Tn last month and he was having the same problem with his 04. What I found out is GM has to do it they don't trust anyone to reset the mileage you can get someone to remove it but GM has to reset it IIRC.
Bobby
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