The 170 cu in. used a standard-duty and the 225 cu in. used a heavy-duty 3-speed transmission. The unit assemblies may have interchangeable, some internal parts were different and you likely don't know the the car's past history. You may be able to match the right one visually?:
So the 2nd gear has already been replaced and the original 2nd gear is no longer with the transmission?
Is there any part number on the gear or on the shop repair order? Does the shop still have their parts order receipt with the gear part number on it?
Is the problem with putting it back together that the gear doesn't fit on the mainshaft or shift fork?
I am limited with non-Mopar part numbers. The best I can tell from the link is that BK299WS fits both a NP903 and A903 transmission. Otherwise there would be 2 different part numbers given AFAIK. Maybe the aftermarket listing is wrong? I would much more trust the factory parts catalog for being correct.
On p. 21-12, see Synchronizer Unit (21-14-1). The standard duty one for Valiant and Dart is part # 2464838. The Heavy-duty transmission uses part # 2464835. So they are different. Those are the 2 synchronizer links that I sent you in post # 4.
On p. 21-9, they list a (standard duty) transmission assembly (21-02-1) for the 170 cu in. Underneath that they list a separate transmission assembly part number for the 225 engine, so there must be differences. They wouldn't use a different part number if they didn't have to.
The standard duty and heavy duty 6-cylinder; 3-speeds may be interchangeable as a complete transmission assembly, although with different, non-interchangeable components inside.
The standard duty 3-speed for Valiant V-100 (170 cu in?) is shown on p. 21-1 and the heavy duty 3-speed for V-200 (225 cu in?) is shown on p. 21-3.
The top cover and gasket shape (21-29-3 and 21-29-25) of the transmissions look different which may help identify which one you have. The top plate of the standard-duty looks almost rectangular while the top plate of the heavy-duty tapers towards the rear.
I'm sure that the 1964 parts catalog covers both North American and Export Chrysler Corporation vehicles. There is no mention about a transmission being different for U.S. or Canada.
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