The 1951-54 manual transmission was essentially the same as the 1948 manual transmission, and there are some good photos in the 1951-54 service manual on this site, and in the 1951-54 Parts book. Look at both the section on the transmission and the section on the clutch.
But, essentially, you remove the 5 cap screws that attach the transmission to the clutch housing to remove the transmission (after having blocked it up, etc.). You don't remove the clutch housing itself.
1951-54 Service Manual
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