So I decided to change my rusty old ujoints for new ones but as I was reading up on it some say to mark the yokes. Being me I didn't do this, is it a big deal? How screwed will I be ? Some say It won't affect anything really but others disagree.
The ones on the ends don't matter, as they're not on there when it's balanced anyway. If it was well made, the other ones shouldn't matter either. If something was out of tolerance with the double cardan/centering assembly, it may have been balanced later with a weight on the outside of the shaft to compensate for the tolerance deviation. If you rotate some parts of the assembly when putting it back together, you may throw it out of balance and pick up some driveline vibration.
The marking of the driveshafts is for when you take them apart. If you rotate one side 180 degrees when doing so you can cause them to be out of phase. The yokes on the ends don't matter how they hook up to the diff or t-case.
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