8 3/4 question

abdywgn said
I believe you are missing one housing, #657. It was used in a 61 only Canadian 383 car if memory serves me correctly. the large bearing in a 742 is the smallest bearing in this unit.
If somebody has an old BCA catalog, please verify this. if not, ignore the ramblings over here...
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Carrier casting number 1820657 is listed under "1-3/8" small stem pinion... (aka. '741')". I didn't list it with the casting number identification though, but this is an abbreviated set of notes.

1820657 was the predecessor to the 2070741 from 1957-1964. The '741' replaced it for 1964-1972.

Similarly, carrier casting number 1634985 was the predecessor to the 2070742 from 1957-1964. The '742' production crossed over with it, then replaced it ~1961-1969.

Carriers 1820657 and 2070741 Timken/BCA/Bower bearing numbers (Cup/Cone) are as follows:
The '742' and '985' front pinion bearing (cone) is the same as the '741' and '657' rear pinion bearing, but the cups (races) are different.