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      11-25-2011, 08:01 AM   #6
HighlandPete
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Drives: BMW F11 535i Touring
Join Date: Mar 2007
Location: Scotland, Highland Region

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The sort of vibration you appear to be desribing does sound like its being generated from an 'unbalanced' rotating source. Gearbox initiated, R or D, would indicate that the 'box/TC is involved.

Wonder if you are getting partial drain out from the TC, used to be quite common on some 5-speed autos *.

Do you have a slight delay when you go to pull off? Different from a normal warm start, where it should instantly give positive drive.

A check to see if it is alternator induced, (once the revs change as you engage R or D), just load the alternator with lights and rear screen, to see if that changes the sound track, while still in park.

* I've had my 330d give a vibration from my gearbox/TC, on several occasions, after not using the car a couple of days. Occurs when D is engaged, slow to pick up drive, by normal standards, but it disappears in a second or so. I've suspected that is a bit of TC drain back.

HighlandPete