Lou,
I have a similar problem with my 420 where it rotates in neutral at the output shaft. My sneaking suspicion at the moment is the pilot bearing is egged from my installation. It was a bear to push into the crank and I think it's pinched. I'm going to pull the bearing and the 420 and try an old spare to see if it is the culprit. But for now I'm still sanding, sanding , sanding!


1970 Chevrolet C10
Grandpa's -- My first truck -- In progress to shiny
Follow the build in the Project Journal
1950 Chevrolet 1-Ton Dually
"Ole Red Girl"
In the Stovebolt Gallery
More pictures here
1951 GMC 9430 1 ton dually--Shiny! | 1972 Chevrolet C20- Rusty- the puzzle box lid for the C10 | 1962 AMC Rambler American- my wife's
Parts trucks-
1951 GMC 9300 | 1951-GMC 9430 | 1951- Chevrolet 1300