slip yoke has a groove in it.

[joe1982]

so i was taking advantage of some free time today and getting around to some things that need fixin on the old truck, u joints. i did the rear, when i finished the front where the drive shaft goes connects to the yoke, i noticed that it had a good sized groove in it. can any one tell me what would cause this? would a bad untreated u joint do this, or is it another much larger problem? the yoke also had some shavings inside, not a crazy amount though, just a little. thank you in advance!


joe.