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3-Series (E46, E90) Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.

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Old 10-17-2011, 09:53 PM   #1 (permalink)
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Resting hand on shift knob bad?

Over the weekend, a friend mentioned that he heard that resting your hand on the shift knob was bad for the transmission. He didn't know if it was true or not, but he said that it had to do with the pressure from the hand preventing enough of a lubrication gap between the gears or something like that. Not to mention driving with one hand doesn't give you optimum control of the steering wheel (I can agree to that).

But do you guys know if there's any truth in that? Thanks!
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Old 10-18-2011, 01:42 AM   #2 (permalink)
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From personal experience, resting your hand on the knob under heavy acceleration and adreneline (trying to kill a smart-ass in a SHO Taurus in my case) can cause the transmission jump out of gear, second gear in particular but I've also had it happen in third when accelerating hard out of a sweeping right hand on-ramp. This is, I was told, because the engine/transmission/shifter is moving around both laterally and radially under load. Your hand will hold the knob in a fixed place and the transmission/shifter movement creates the same effect as if you pushed/pulled foward/backward slightly on the shift lever, hence it pops out of gear. That's what I was told, may be total BS but in fact, since I was told this I've kept my hand off and have not had it pop out of any gear again.
The other reason is posted on RE's site, you can read it for yourself:
http://www.rogueengineering.com/Merc...gory_Code=SNNN

I Googled it and found this answer check it out....
Do you rest your hand on the shift knob? - Bimmerforums - The Ultimate BMW Forum
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