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They are all good for their intended purpose. The 700R4 has overdrive, so it can help with gas mileage, but can't withstand as much torque as a 350. The 350 is economical to rebuild, and can take a lot of abuse, but the 400 is the heaviest duty of the three. It can handle big, high performance engines with a lot of torque, but consumes more of the engine's horsepower because of it's higher reciprocating mass.

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