What size speedometer gear to correct speed reading?

[bradleyfutter]

Hi there,

Was wanting to put 31's or 32's on my TJ but have been told it will put my speedo out by around 10-15% maybe as high as 20%... have seen you can buy different sized speedometer gears to correct the readings, but it seems to depend what gear ratio you have? Anyone know what the gear ratio for a 2005 TJ is?

Im not sure which of the two or if any of these is even correct? but this is what google seems to tell me :P

4.1 ratio means you need a 36 tooth/32" or 37 tooth/31"
4.56 ratio means you need a 40 tooth/32" or 42 tooth/31"

[reyzor]

speak to wooders, im sure he has a table floating around that shows what size gear you need for your ratio/tire size

[VIN18U]

100% wooders, i bought my speedo gear from him and works a treat.