you need a new speedo gear, which you should be able to source through your normal jeep servicer, otherwise most of the suppliers on this board would be able to get you one. You just need to advise tyre size and diff ratios.
However, I did find that when I went from stock to 31's my fuel consumption went from around 500kms/tank to closer to 400kms. Of course, I did put simex ET2's on the car which are very nobbly, so could have been choice of tyre rather than size. On top of that, I couldn't use 5th gear anymore, unless I was driving down hill with the wind behind me. This is in a manual, auto would be less of a problem because of the higher standard ratios.
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'03 Intense Blue TJ: 33" claws 3.5" RE lift
'14 WK2: offroad pack
Previously, XH and XJ
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