My car has a now 3 1/2 year old reconditioned box, but has always (as I can remember) had a slight but noticeable whine when in park or D which disappears when put in D/R. I thought that this was normal, is it not? What problems might it lead to?

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190E's:
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner
http://www.maylane.demon.co.uk/190esmall.jpghttp://www.maylane.demon.co.uk/190esmall2.jpg