33in tires and speedo is off
 

I just put a 4.5 lift on my 98 xj and I have 33in tires under it. Since bigger tires throws your speedometer off. Is there anything out there to calibrate it back?

Im pretty sure re-gearing...Correct me if I am wrong..

All you have to do is buy a different speedo gear to accommodate for the different size of tire. They can be bought from plenty of places for all different sizes of tires.

Thanks for your help!

30 tooth short shaft speedo gear

Personally I'd go with the 31 tooth shaft if the OP still has 3.55 gearing. I ran it and was GPS accurate. Not that a MPH or two will make much of a difference most of the time.

Here is a good link to the swapping of the speedo gear. Also, it includes a chart that shows the teeth counts that have been GPS verified for gear/tire size ratios.