The importance of measuring bell housing runout.

however the process to both shim and align a bellhousing is in my factory manual
decsribed in a way that makes you mentally i'll....:) covers both auto and manual
they say it must be done if you swap the bell from the orginal one for a manual trans

1971 VH Valiant Australia factory manual... presume others have it as well. chrylser stock photos rather than car specific. i.e numerous LHD photos in a manual for RHD Cars in the suspension and drive train sections

the first post video is prefect for run out...its a great thing
Now THAT makes sense!