Thread: need help
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Old Apr 17, 2009 | 08:24 PM
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froggiemustang
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Default need help

i have a 79 mustang with a c4 tranny and a 3.73 gear rear end and my speedo is off by 10 to 20 mph when im driving i know i to get something for it and i dont know if i have to go to a speed shop or a tranny shop
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