after buying my 94 camaro Z28, ive noticed the speedometer is off by about 10-15 mph. i do know at 20 mph it is acurate. but at about 70 mph its only really going 55 mph. so anyone have any idea what it might be? the tires are 16". so other than the size of the tires, what else might be the problem? can this problem be corrected by a computer? respones would be appreciated, thanks.

 

sounds like someone changed out the gears and did not reprogram the computer for the new gears.