The car does not make any sound, I beleive it is the torque of the engine, when engaging the rear end, it pulls the rear springs downward. And the opposite is true, when it goes into drive. The rear of the car lifts up.
How many SL out there do the same thing?

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Stable:
1973 450sl
1978 red diamond ice vette
1975 steel blue convertable vette
2002 steel blue dakota quad.