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Old 11-05-2012, 06:22 PM   #1
barrykathy
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Join Date: Oct 2012
Location: new branfules tx
Posts: 8
how to calidrate 1971 speedometer

i have 1971 GMC 1500 6 cyl. the stock rear end 3.73 i changed to a 3.07 now the speedometer is off by about 15 MPH is there a way to calibrate to speedomete
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