MY CHEVY TAHOE WAS BEING DRIVEN BACK FROM WATCHING THE NASCAR RACE IN THE POCONOS PA WHEN DRIVING ALONG INTERSTATE 84 TWO OF THE THIRD ROW PASSENGERS COMPLAINED THAT THEIR SHOULDERS HURT FROM THE SEAT BELTS NOT MOVING. THE SEAT BELTS LOCKED IN PLACE AND ONLY WOULD LOOSEN UP WHEN THE SEAT BELT WAS RELEASED FROM THE CLIP. BEFORE PASSENGER FEMALE GIRLS AGES 12 & 11 USED THE ADJUSTMENT STRAPS IN THE VEHICLE SO THE BELT WOULD SIT PROPERLY ON THEIR SHOULDERS. AFTER STOPPING TO EAT. THE 11 YEAR OLD WAS UNABLE TO STRAP IN AGAIN SINCE THE BELT WOULD NOT EXTEND THE 6 INCHES MORE TO GET IT TO LOCK INTO PLACE. BOTH GIRLS DID RECEIVE BRUISING TO THERE SHOULDER. GM SAYS THERE IS NOTHING WRONG WITH THE SEA BELTS IN THE TAHOE AND REFUSES TO FIX OR REPLACE THE TAHOE/SEAT BELTS.