MY TRUCK HAS A STEERING ISSUE WHILE UNDER NORMAL DRIVING LOTS OF PLAY ON STEERING WITH A SERIOUS SHAKING FROM STEERING WHEEL AND STEERING COLUMN MOVES WHEN U PUSH IT UP OR DOWN OR SIDE TO SIDE ALSO WHEN DRIVING UNDER NORMAL CONDITIONS TRUCK IS SHAKING ALOT AND BOTTOM OUT WITH A HUMMING SOUND FROM FRONT END CLOSER TO LEFT AND RIGHT TIRE NOW WHEN BRAKING UNDER NORMAL DRIVING TO A COMPLETE STOP I FEEL LIKE I BEEN HIT FROM THE REAR OF MY TRUCK .MY TRUCK HAS 51000 MILES AND I BEEN TRYING TO HAVE MY TRUCK FIX SEVERAL TIMES WITH CHEVY CORPORATE AND NO OUTCOME WITH THE DEALERS THERY PROVIDED QUOTED THEREFORE WE DO NOT REPAIR DESIEL TRUCKS AND I HAVE NO DESIEL TECH ...PLEASE HELP ME FIX MY TRUCK..