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This question can be answered easily--how much TALLER will your new tires be, compared to the old ones, calculated as a percentage of the old tire size.
If it's more than a 5 percent, plan on getting a new speedo gear.
The 88 XJ service manual I have for my XJ has a speedo gear chart. If you have the automoatic with the starndard gearing - 3.54 - then you are just fine. My XJ uses a 33 tooth gear for both tire sizes
I've run my 2000 through a couple of those radar trailers some police departments are using now. With stock 225/75 tires, my speedo reads faster than actual speed. Moving up to 235 would probably make the speedo just about correct.