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Originally Posted by Flakbadger
removing the default equipment (engine, axle, etc. etc.) and replacing with modern components might save some weight, due to alloys and the fat-trimming that modern pieces have undergone
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In many cases, replacing an old 3-on-the-tree with a floor-shifted 5-speed increases the efficiency without significative weight differences, altough often they can be even lighter...
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I don't think a modern diesel will necessarily be lighter than the cast-iron gasser it's replacing.
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Modern is a relative concept, i.e. regarding an old gasser from the 50's to the 70's and a light high-speed Diesel from the 80's. I've already seen many old American cars retrofitted with 4-banger high-speed Diesels under 3-litre, lighter than their stock V8 gassers usually above 5-litre and actually not feeling so underpowered at all
