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There is a lot to consider when swapping transmissions as far as performance is concerned. However changing from an automatic transmission to a manual transmission will typically improve the efficiency of your drive train. You lose power with a torque converter, because it's constantly "slipping" in order to drive the transmission's input shaft. General rule of thumb for older makes is that with an automatic you'll have lost about 20% of your engines output by the time it reaches the pavement, and with a manual you will only loose about 10%.

NOTE: Newer automatic transmissions have been built to be much more efficient than I am reflecting here.

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Q: Can changing an automatic transmission to manual change performance?
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