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02-05-2012, 06:29 PM
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Registered User
Join Date: Nov 2011
Location: Nashville TN
Posts: 3,595
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Speedo fast and jumps at 70mph
So My speedo was crazy jumpy so I replaced the cable and it works great! Now I have tires that are 2 big so the speedo reads about 3 -5 mph faster then I actually go but when I hit 70MPH it starts jumping between 70 - 100mph...
So what could cause this? Is it the speedo gear? If so do I need a smaller or bigger tooth gear to get it closer to the right speed? Currently have a 21 gear speedo gear Thanks
__________________
PLEASE HELP WITH PROJECT UNDERHAULIN http://67-72chevytrucks.com/vboard/showthread.php?t=306320 Gemini - 1978 GMC C15 High Sierra - 305 c/e - Given to Mother Electra - 1967 Mustang Coupe - 302/w 3 speed Build Chyna - 1968 Chevy C20 Long Stepper
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