Okay heres my story, my friend has a Jimmy an 83 and he and I were both wondering why his speedometer is off 15-35 mph. He can't get it over 65 but mine pins out at 85 when he is at 65. He has only a 4" suspension lift and has reset his speedometer twice and bought a new one. I can't figure it out. ANYONE ELSE EXPERIENCE THE SAME PROBLEM?