I dont think that the tires are going to effect the spedometer that much. Try driving the car up to speed and smacking the dash with the palm of ur hand if the spedometer shoots up to the correct speed then looks like its the spedometer it could be the speedometer or the speed sensor in the transmission iam leaning more towards the speedometer have seen alot more of them go bad good luck let me know what u find.
Louie
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Thursday, October 8th, 2009 AT 5:37 PM