Remember, the manual 240 has an EXTREMELY low (high numerical) final drive ratio. Coupled with a lot of flywheel mass and torque you get that jumpyness. FWIW, I have a parts car that was an '85 300D converted to a 240 manual. It had a 2.88 : 1 final drive instead of the 3.70 to something that the stock 240 has. At start-up, that car did not exhibit any of the jumpyness I've come to associate with my W115. I think it simply didn't have the leverage to jump as bad with those tall gears.

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Never a dull moment at Berry Hill Farm.