Punch - The presence of the inner bearing cup "909626" would indicate your spindle is the late 1935 thru 1937 spindle, as that bearing component is listed as required for use with the previously identified GM# "607317" steering knuckle (spindle) mentioned above. *
The steering arm "377985" is listed in the 1941 Chevy Parts Book as shown below. Again it is listed for 1935-37 Utility trucks (1-1/2 ton) which would further confirm the above info too. Hope this info helps confirm what you have.
* Note: The earlier 1941 Chevy Parts Book ID's your spindles with an earlier part number "601474", but the same specific bearing requirements as the 1946 spindle. Same part, just a changed number.
