If the pan has an oddball shape with a bulge on one side and the modulator is 2/3 of the way back on the passenger's side, it's a TH 400. 350's have a basically square pan with one corner nipped off. A TH 400 has an electric kickdown with a single wire connector going through the transmission housing just above and slightly to the rear of the shift linkage.

Pan #3 is a TH 350. #4 is a TH 400:
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Jerry


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