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Message: <blockquote data-quote="atrainsgt" data-source="post: 388504" data-attributes="member: 10219">Hey guys I found a website with 2 sets of codes for the Extended Range speedcal. The settings on the right hand side of the website are for the cars with a 2.73 stock ratio(mine was) and the ones on the left hand side are for the ones with a 3.27 stock ratio. These settings put my speedo where it is suppose to be, its accurate now. My speedo has read 5mph slow since I installed the speedcal 6months ago because I had to guess at the settings the first time around because the speedcal calculator on DallasMustang.com does not give the correct settings needed. Anyway I thought I would post this so you all don't have to go through the- "zero your odometer then drive 10 miles and call dallas mustang with your reading off your odometer for them to give you the correct settings. Hope this helps<a href="http://64.233.167.104/search?q=cache:xWswVgSeeQcJ:lib.store.yahoo.net/lib/mustangtuning/speedcal.pdf+2.73+to+3.73+speedcal+settings&hl=en&ct=clnk&cd=5&gl=us&client=firefox-a" target="_blank">http://64.233.167.104/search?q=cache:xWswVgSeeQcJ:lib.store.yahoo.net/lib/mustangtuning/speedcal.pdf+2.73+to+3.73+speedcal+settings&hl=en&ct=clnk&cd=5&gl=us&client=firefox-a</a></blockquote>