Is it worn on the cup that the dogbone sits in, or the bearing face? has the outdrive bearing been ceased and the outdrive been turning in the bearing seat?
As Ralphy mentioned, this would cause problems.
I had a gummed up outdrive bearing recently. It ran straight, but would spin out and donut on some loose corners when trying to get the power down.
But I also had a diff and tranny full of black gunk, which I know wasn't helping as the diff felt crud.
Have you checked your chassis for straightness on some glass?
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