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Discussion Starter · #1 ·
I know that if you increase your tire size you have to correct your speedo. I am wondering if you change you diff ratio do you need you correct the speedo?

tire change was from 28 (stock)to 31s (33s in the near future)I corrected the speedo. Now I'm changing my gear ratio to 4.56 from 3.55 (I think)..

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86 XJ, Procomp 3 inch lift w/ 31s and STUFF......
 

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Discussion Starter · #4 ·
If I were to do it correctly and match my gears to close to stock w/ the tire change. Will my old speedo gears work. Will my speedo be close to stock or will I have to purchase new ones?

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86 XJ, Procomp 3 inch lift w/ 31s and STUFF......
 
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