I have aslight vibration since the last time the shaft was out na dI am woundering, if maybe the shaft was turn 180 degrees from the last time it was in, But my ? is why would it matter.

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btt

 

It doesn't take much of a variance to cause a vibration and if there is some imbalance in the companion flange (yoke), it can be somewhat countered by any imbalance in the driveshaft 180* out. For example, say you have like 3 grams out of balance on one side the of yoke, and 5 grams on the driveshaft. With the two heavy spots 180*, there is only 2 grams out of balance which may not be felt, but with both heavy spots on the same side, now you have 8 grams out. These numbers are only used for example, but I think you get the picture. If the shaft and yoke are perfectly balanced, then it won't matter either way.

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