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      12-03-2010, 11:24 PM   #233
dcstep
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Drives: '09 Cpe Silverstone FR 6MT
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Location: Colorado

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2009 M3  [8.40]
Quote:
Originally Posted by jms_w View Post
I've heard that skipping gears while upshifting is very bad for the tranny. I don't have a grind but I do feel resistance in pulling from 1st to 2nd, kinda have to force it in and there's a clunk.
Where do these old wives tales come from? Skipping gears has no impact on the transmission when done properly. I've got over 1-million miles of skipping gears with no ill effects. Around town I do 1-3 pretty often when I'm in no hurry. Going the other way I might jump from 6th to 3d if I really need to hot-foot it.

Any resistance going from first to second in a healthy transmission is due to mismatch of engine and tranny speed. For instance, if you gently accelerate to 5000 rpm in first and then shift to second, the engine speed will need to drop to around 3000. There'll be resistance if you try to push it in at 4000 or wait until 2000 rpm.

If you go up to 2000 rpm and do the shift and wait a full second, that might cause resistance, but shouldn't result in a grind.

Dave
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