I HAVE A 2003 CHEV SUBURBAN 2500. WHEN YOU PUT IT INTO 4X4 IT HOPS AND JUMPS.

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INSTALLED A NEW TRANSFER CASE AND THE CODE THAT COMES UP IS CO306-MOTOR A/B CIRC MALFUNCTION. CO 321 T/C LOCK CIRC FAULT .... AND CO 327 ENCODER CIRCUIT MALFUNTION. THE SUV JUMPS AND HOPS ALMOST AS IF THERE ARE DIFFERENT SIZE TIRES OR THE WRONG GEAR RATIO IN IT . USEING THE SCANNER TO ACTIVATE THE 4X4 SWITH EVERTHING APEARS TO TO FUNTION PROPER. THE TRANSFER CASE OUTPUT SPEEDS ON THE HOIST RUN ALMOST PAR. WHEN YOU GO FOR A DRIVE ON THE PAVEMENT THE REAR READS 1080 AT 40 KM AND THE FRONT READS 850 AND HOPS AND JUMPS . ANY HELP FOR AN AREA TO LOOK AT OR IF ANYONE HAS HAD A SIMILAR SITUATION WOULD BE GREATLY APREACATED. THANKS FOR THE TIME.