WHAT WILL CAUSE MY 1993 1500 SIERRA TO VIBRATE COULD IT BE THE U JOINTS IT HAS BEEN MAKING A WHINNING SOUND?

THE VIBRATION COULD BE ANYTHING, U-JOINTS ARE BIG, OUT OF BALANCE TIRES, EVEN "CUPPED" TIRES CAN CAUSE VIBRATION ISSUES, TIRES R EASY ANY SHOP CAN BALANCE TIRES USUALLY FOR 50$ ANY MORE THEN THAT YOUR OVERPAYING FOR SURE. IF THE VIBRATIONS STILL THERE CHECK THE UJOINTS, IF THEYRE WORN OUT THEY WILL FEEL STILL WHEN TRYING TO MOVE THE JOINT AROUND. IF NEITHER OF THESE CORRECT YOUR ISSUE IT NEEDS TO GO TO A TECHNITION SO THEY CAN PROPERLY TEST IT, TELL THEM WHAT YOUVE DONE. ALSO GIVE MORE INFO, SPEEDS IT HAPPENS(GETS WORSE AT), CORNERING, UNDER LIGHT OR HEAVY BRAKING, LIGHT OR HARD ACCEL. ALL THESE COME INTO PLAY TO INSURE THE TECH DOESNT JUST START THROWING PARTS AT IT TO "CORRECT" THE ISSUE BECAUSE THAT CAN GET EXPENSIVE.

Thank you for your answer. I have one more questions about how much would it cost to have the u joints fixed. I am a single mom and don't have alot of money to spare. I am a decent mech is this something I could do myself.

IT IS SOMETHING MOST PEOPLE CAN DO AT HOME OR IN THE DRIVEWAY WITH SIMPLE HAND TOOLS, HARDEST PART IS GOING TO BE GETING THE RETAINER CLIPS THAT HOLD THE JOINT HOUSINGS OUT IF THEYRE VERY CORRODED OR RUSTY, USUALLY ITS FAIRLY EASY, A HAMMER AND A VISE USUALLY CAN GET THE JOB DONE, IF YOU HAVE THE SHAFT REMOVED AND END UP GETTING STUCK, U CAN USUALLY GET LIKE A SMALL GARAGE TO REPLACE THEN FOR MAX 25$ A JOINT MOST OF THE TIME CASH TALKS BIG FOR 5-10 MIN WORTH OF WORK FOR A MECH. I DO THESE ON A REGULAR BASIS SEEING AS I AM A TECH. AND THE HARDEST PART LIKE I SAID R THE RETAINER CLIPS IF THEYRE ROTTED OR RUSTED IN PLACE JUST LET THEM SIT IN WD40 OR ANOTHER PENITRATING FLUID SOLUTION USUALLY WORKS GOOD, NEVER TAKEN ME ANY LONGER THEN 20 MIN TO REPLACE DRIVE SHAFT U-JOINTS