Posted January 18, 200322 yr comment_23620 :classic: Is there any one out there that can tell me the aprox difference there will be when I change diff. , that is at say 60mph . Presently I am running 3.54 s and am installing 3.70 not a big jump ,but I was wondering what to expect after all is completed. I am going from a good R-180 to a newer R200 just wondered if it was worth the effort , thanks for the input stupid: Link to comment https://www.classiczcars.com/forums/topic/4317-rear-end-ratio-to-speedo-change/ Share on other sites More sharing options...
January 18, 200322 yr comment_23626 You won't see much of a difference at 60 mph in fourth gear (standard 240Z 4 speed trany) running 206/60/14 tires.Only 132 rpm.Here's the site that has the calculator I used.http://www.geocities.com/z_design_studio/ Link to comment https://www.classiczcars.com/forums/topic/4317-rear-end-ratio-to-speedo-change/#findComment-23626 Share on other sites More sharing options...
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