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3.55 speedo adp [message #290256] Thu, 12 November 2015 07:59
strod32 is currently offline  strod32   United States
Messages: 5
Registered: July 2012
Location: Schaumburg IL
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Junior Member
I have a brand new speedo adaptor for your gmc if your running a 3.55 gear with 16.5 wheels. the ratio is .8650 , 140.00 free ship to lower 48
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