Ron,
I will add my $.02 worth in here to offer another "alternative" tool.
First, a check of various Chevrolet Master Parts and Accessories Catalogs, starting with the 1929-41 Book, indicates that the "bearing retaining nut with oil slinger" is GM# 591150.
Second, a check of GM# 591150 through
GMPartswiki shows that the same part number was used in all the early (1937-50) standard 3-speeds, the SM318 3-speeds, as well as later Muncie (1963-74) 4-speeds. Same part number across all these transmissions, checked through the various Parts Books through the 1979 edition.
That being said, it should be safe to assume that a more recent "wrench" for removing said retaining nut w/slinger for the Muncie's should take the place of the original J-112 removal tool.
Jethro's "J-933" wrench would work, if you could find one. Here is a link (not mine) to an
Inexpensive wrench designed to do the job for Muncie's and should work just fine for your 3-speed. No fabrication or modification involved and readily available.
Let us know what you figure out and what may or may not have worked.
Dan
