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Depending on the year of your car, will also need significant engineering changes from torque tube to open drive for the diff location. Has been done before, but a lot more than just changing the transmission.

Most (all?) of the (easy) swaps are into series 40 Special & series 60 Century cars using diff's up to 1954. I do not have my parts books with me, but from memory series 80(70?) Roadmaster & series 90 Limited diff's are very different. Brakes are a lot bigger. So I suspect not the simple swap...

Not for 1946. And no "build sheets" VIN did not start until mid 1950's and were not standardised until 1981, with the 17 characters https://en.wikipedia.org/wiki/Vehicle_identification_number In USA some states titled cars by the engine serial number and others by the frame/chassis serial...

As part W Group 5.517? As above expect this will be common over many years Unsure if image will show for you. Is linked from AACA.Org

Sign up (free) and ask here ---> https://forums.aaca.org/forum/60-buick-pre-war-technical/ Where are you~car located?

Nice car. What are your intentions with it? 4557 = 56S Sports coupe with rumble seat 4 = Buick 5 = 50 series 57 = body style GM Buick Canada had a different numbering system to GM Buick USA

The topic may get more traction in https://www.teambuick.com/community/index.php?forums/transmissions-and-drivelines.79/ There a few suttle difference between the Owen C recon torque ball ex Napier (as photos above) and some photos I have of a NOS

From http://www.classiccardatabase.com/search.php?year=1951&make=Buick&series=4843 1951 46 wheelbase = 121.5 http://www.classiccardatabase.com/search.php?year=1975&make=Buick&series=7773 1975 Rivera wheelbase - 127 But I have read about guys putting old bodies on 1970's chassis. You just...

Try Dave Tacheny as in http://www.prewarbuick.com/links.php 1940 the same or very close