Could be an alignment issue. I believe the correct procedure is to loosely install and then roll vehicle forward and back to let assembly "settle" in correct location before tightening.
I have followed that procedure to fix vibration after carrier bearing install.
I am not understanding how wrong direction would cause vibration.

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1985 300 TD 448K
1984 300 TD 278K

1983 240D euro 240k
1994 f-250 idi turbo 330K
1986 f-350 IDI
1987 F-350 IDI

1985 JD 1050 4wd
1965 IH 3660