Can't find axle housing length.
But here is left and right axle shaft OL overall length.
51-57 1/2 ton, left.....29 5/8"
51-57 1/2 ton, right...30 5/8"
..........................+60 1/4"
Source
1929 - 1957 Chevrolet Master Parts & Accessories Catalog Group number 5.420
Looks like all 1951-57 1/2 ton axle housings were the same length. They all used the same length axle shafts.
