RobPearce Posted April 19, 2017 Share Posted April 19, 2017 I've certainly had speedos that were rather more than 10% optimistic in the past. Surprisingly, my GT6's speedo appears to be spot on - which is to say it was 5% low when it had a 4.11 diff and is now about 7% high because I've fitted a 3.63 Quote Link to comment Share on other sites More sharing options...
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