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It can be done. The 400 will need to be the same length as the 350. Both were available with short and long tail shafts. Some vehicles came from the factory with both bolt patterns drilled in the frame to move the tail shaft mount. For those, either one will work. The front driveshaft yoke will need to be changed, and the kickdown will be a little different (mechanical vs. electric). It's easiest if your chassis was offered with a 400 as an option.

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Q: Will a 400 transmission fit a 350 motor with a 350 transmission already on it Or do you need to make any changes to the 400 the 400 seems a little longer than the 350 that the car already has?
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