63/64 Cadillac Website

1964 TH400 Torque Converter?

Hey guys! I’m back with another question lol. I noticed some vibration under acceleration while not moving that I suspect may be coming from the torque converter, so I’m looking to replace it while I have my engine out. Seems like a good idea, but I’m having trouble locating a new or rebuilt converter. I found this one below (link) at AutoZone that says it fits my 1964 Cadillac Deville (429 engine w/TH400 trans) however while reading the description it states for flat top bell housing, but my TH400 is round. Does anyone have any thoughts on this or can provide a part number?

https://www.autozone.com/drivetrain/transmission-torque-converter/p...

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Permalink Reply by Jacob Foster on September 24, 2025 at 5:53pm

FYI guys - this torque works! Just thought that I’d share the feedback in case anyone else comes across this issue. The new torque converter does have 6 lugs, whereas the original only had 3…spoke with the rebuilder and they confirmed that it would work. It did. I used 3 of the 6 lugs to bolt up to my original flywheel.

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