1947-53 trucks used a rear of transmission mount on a frame cross member.
These were sometimes removed when servicing transmissions from below.
This mount was there for a reason (necessary support).
The rear of engine crossmember changed in 1954.
1954/55st trucks with manual transmissions did not use a rear of manual transmission crossmember (and, therefore, no year of transmission mount.
However, a 1954/55st truck with a Hydra-Matic transmission had removable cross members at the front and rear of the transmission.
