As long as the front and rear tires are the same size (you replaced all 4 right?) that should not be the problem. If you were mudding check all your TOD connectors for wet or mud in them. Clean and dry. Check the TOD fuse. Also have you tried resetting the computer? To do so disconnect the battery for 30 minutes then reconnect it. If none of this works hopefully someone else will chime in with more advice, but I think this is a good start.