Mate
what tyre size you are running.
If you are runningg 33 tyres take ur jeep to ur dealer ask them to hook up the computer and they can adjust upto 33 tyres in few seconds
If you are running over 33 tyres then you need a programmer to correct them. If you have Diesel you can buy AEV ProCal from JeepKonnection and it comes with all the other goodies
If you have petrol then you have many choices AEV Procal, Hypertec Max Energy, Hypertec Speedo or SuperChip
hope that helps
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