Ad seems confident its a TH350. If it is actually a TH400, I would guess that the factory A/C triggered an upgrade. I've shared before that I had a '69 Firebird 350/2bbl with A/C that had a TH400. It was an untouched car that I couldn't figure out why it had that transmission. Apparently engineering decided that was needed for the application. I'd be curious as to the reasoning.
Last edited by tom406; 12-13-2018 at 12:58 AM.
Reason: Clarity
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