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The short answer is no.

The long answer is you can make it fit because it does bolt to the same holes on the engine. Driveline length will have to be changed a few inches as the 400 is longer than the 350. Also the "kick down" control on the transmission is different from model to model. It can be done, but takes a little work. The crossmember will also have to change location which may require drilling a few holes in the frame.

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Q: Is a TH350 transmission the same size as a TH400 transmission?
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