The Chevrolet truck specifications, as reproduced in the Chevrolet truck restoration packs, show transmission input torque capacities, at least for 1953 and 1954, which are the years for which I have the resto packs.
Curt ---- 1953 Chevy 6400, 1957 Chevy 2dr Sedan --"Mediocrity is easy, the good things take time"