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Hello Luis.... It sounds like the u joint itself is worn out and needs to be changed. Here is how to check it out:
Things You'll Need:
THERMAL TEMP GUN
PARK VEHICLE ON LEVEL GROUND
AFTER WHEELS ARE BLOCKED! (MAKE SURE WHEELS ARE BLOCKED SO VEHICLE WILL NOT ROLL) PLACE VEHICLE IN NEUTRAL. "WITH ENGINE OFF!!!!!" NOW GET UNDER VEHICLE TO ACCESS DRIVELINE.
NOW THE PRESSURE IS OFF U JOINT BECAUSE THE VEHICLE IS IN A NEUTRAL STATE!!! GRAB THE DRIVELINE AT THE FRONT AND REAR JOINT. SEE IF YOU CAN GET IT TO MOVE UP AND DOWN. IF IT HAS MOVEMENT IT IS BAD! IF NO MOVEMENT, MAKE SURE TO LOOK AT THE UJOINT IT'S SELF TO SEE IF IT SHOWS SIGNS OF DAMAGE. IF YOU STILL CAN NOT LOCATE IT? STEP FIVE IS THE FASTEST WAY TO MOST LIKELY FIND THE BAD UJOINT! BECAUSE IT IS NOT BROKE OR MOVING ALL OVER, DOES NOT MEAN IT IS NOT BAD! U JOINTS HAVE TO HAVE GREASE! WHEN THEY BECOME DRY AND STILL FEEL TIGHT! READ ON TO FIND OUT A PRETTY FAST WAY TO FIND IT!
YOU ARE GOING TO REPEAT STEP ONE AND TWO AGAIN, BUT FIRST "WITH VEHICLE COLD", DRIVE A SHORT DISTANCE AT NORMAL SPEED. NO LESS THAN 5 BLOCKS AND NO MORE THAN A MILE. STOP VEHICLE AND REPEAT STEPS ONE AND TWO AT THIS TIME! ONE MORE STEP TO GO!!!
AFTER BLOCKING WHEELS AND PLACING VEHICLE IN NEUTRAL, "WITH ENGINE OFF!!!", CLIMB UNDER VEHICLE ,TAKE A THERMAL TEMP GUN AND POINT IT AT THE UJOINT IT'S SELF. COMPARE THE FRONT UJOINT TO THE BACK UJOINT! THEY SHOULD BE REAL CLOSE TO THE SAME TEMP, IF ONE IS HIGHER IN TEMP BY MORE THAN 8 DEGREES, IT IS MOST LIKELY THE BAD ONE. HAVE IT REPLACED BY A QUALIFIED AUTOMOTIVE TECHNICIAN.
The drive shaft will need to be removed. Remove ujoint cap clips from yolk and shaft. Should be four all together.tap out the u joints.
Remove cap from new ujoint. place into yoke from outside. Slip ujoint inside, attach to cap. press ujoint into housing. do the same with drive shaft side. Dont forget to put the new clips provided, on the shaft and yolk
take the wheel off , unbolt caliper and sling it out of the way with a bungi cord, take off the rotor, then you have too take the pumpkin cover off the axel diff in the front (drain fluid first) easy way to do that take out bottom and side bolts out then leave top 1 or 2 in but finger loose. pry cover off with a sturdy scrapper from side allowing fluid to leak out from bottom of cover. when fluid is done comeing out then take off cover. to take the axel out to replace the seal you have to push the axel inwards to remove the C- CLIP on the end of the axel shaft that slides into the inside of the pinion gear (use a extending magnet) keeps gear oil on your hands and from dropping it into the pumpkin housing. then all you have to do is slide the axel shaft out. then replace the seal .