I would pull the bolts out of the top cover and see if you can lift it a tad and see if the shift forks are where they need to be. It sounds like something is not lines up properly.

with the top off, you should be able to make sure it is in neutral and spin the rear yoke by hand.


Mike
1955 Chevy 6400 ex-flatbed (no bed now!) sold September 2023
In the Stovebolt Gallery
1958 Chevy 6400 flatbed W/dump
In the Stovebolt Gallery
1959 Chevy Suburban Owned for almost 20 years, Daily Driver -- sold May 2016
In the Stovebolt Gallery

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