Ball joints are in the front suspension, it is basically what the wheel assembly pivots on when you turn. Universal joints are on the ends of the drive shaft in a rear wheel drive vehicle. At the transmission and rear end. They give the drive line some flexibility. The same principal is in front wheel drive but are referred to as constant velocity joints, or CV joints.
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Some ball joints are pressed in and others are bolted in, it depends on your style ball joints.
YOU CAN GET A FEW YEARS OUT OF A SET OF BALL JOINTS, BUT THEY WILL NEED TO BE GREASED REGULARLY. USUALLY YOU WOULD HAVE THEM GREASED AT THE SAME TIME AS YOU HAVE YOU CAR SERVICED(OIL CHANGE ECT). A NEW SET OF BALL JOINTS MUST BE INSTALLED CORRECTLY USING THE PROPER TOOLS OR BY A PROFESSIONAL. SOME MANUFACTURERS OF AFTER MARKET PARTS HAVE POOR QUALITY PARTS AND THEY DO NOT LAST AS LONG AS THE ORIGINAL MANUFACTURERS PARTS DO. MY FATHRE HAD A SIMILAR PROBLEM WITH HIS CHEV SUBURBAN. WE HAD TO REPLACE THE BOTTOM BALL JOINTS A SECOND TIME WHEN WE HAD ONLY A REPLACED THEM A YEAR BEFORE. LUCKLIY FOR US THE MANUFACTURER OF THE AFTER MARKET PARTS HAD A WARRNTY ON THE BALLJOINTS AND WE HAD THE PARTS REPLACED WITH A NEW SET FREE. YOU MAY WANT TO CHECK WITH THE PART SUPPLIER YOU PURCHASED YOUR PARTS FROM TO SEE IF ANY WARRANTIES APPLY.
call you local parts store. they are also sometimes very labour intensive to change
Correctly phasing the u joints will prevent driveling vibration Doing it incorrectly can cause a damaging vibration that can ruin, transmission, transfer case, differential etc.
usually you have to press, or pound with a hammer...if the joints are riveted in you need to break the rivets, perhaps with a chisel...on rare occasion the joints are not servicable and the whole control arm need to be replaced