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With some careful tuning, you should be able to boost that 450SL from 9mpg to perhaps 14mpg. Which would be a noticable savings. But to change the transmission, you're looking at some major surgery which will never, ever pay for itself. For instance, the correct 4-speed that mates up to the motor will cost you about 1,000$ along with the clutch, flywheel, shifter, pedal, etc.
-CTH
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