Quote:
Originally Posted by deanyel
Adding gears wouldn't do much for mileage anyway. A taller rear axle ratio might help a bit but what you really need is a smaller more efficient engine and a lighter chassis. Poor fuel economy is in your car's DNA.
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The 722.6 Transmission has 5 gears with the last gear overdrive it also has a lockup converter. These features were not even available in the later 560SL. If they will bolt up, and I wish I would have checked while I had them side by side the 722.6 should increase gas mileage.