speedometer help
I have a buddy that has an 03 silverado, his speedometer is stuck at past 120mph. what could be wrong with this thing?? 
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68 c-10 1/2 ton swb fleetside, 79 GMC Sierra Grande 1/2 ton swb fleetside, 99 Dodge Durango 4x4(wifes ride  ),53 and 55 chevy trucks(dads trucks  )
54 caddy 62 series 4 door(younger sons ride, aka 54caddy )
70 caddy 2 door, 89 chevy silverado stepside(older sons rides )
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