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Younggun, good luck with your T-bird EV. Ditto on the homebrew hybrid being difficult.
Slushboxes aka automatic transmission *the complete drivetrain* reduces power by 25% compared to the 15% a manual drivetrain gets on average. I haven't seen anything suggesting higher losses, but I've heard of auto's getting 75% their rated crank horsepower and manuals being so consistently close to 15% that people use the 15% driveline losses to calculate crank horsepower. The transmission and differential are a box of gears filled with slippy oil. But there is also the driveshaft, rear axle, two wheels and their tires, u-joints, wheels bearings, I'm sure there a few more parts.
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-Allch Chcar
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