I heard them called that on cars I think they call them knuckle joins on 4 wheel drive trucks. CV joint means constant velocity joint and on frontwheel drive cars these usualy have rubber boots around them and they are greased. On 4x4 trucks they are open to the elements and are like very large U-Joints that are sealed units. I dont know for sure I just shade tree mchanic cause I cant afford to pay someone else to do the work. If its what im thinking its the part that goes into the front dif and has a U joint at the end right behind the spindle. The spline comes threw the spindle to turn the front wheel. Just did the ball joints and hubs on my truck this summer so had to take those shafts out.
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