740i not shifting properly - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 10-01-2011, 12:26 PM
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740i not shifting properly

Im not sure where to start looking, but it started randomly. when i drive easy (not revving above 3g) it will shift through all the gears with no issue. If i drive it harder it wont shift past 3rd gear until i throw it in the sports mode, then it will shift. It doesn't shift hard, slip or jerk. not sure if its a tranny or engine issue. and theirs no check engine light on
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#2 (permalink) Old 10-01-2011, 01:04 PM
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When was the last time the tranny oil/filter was changed (Ignore the "Lifetime" crap)?


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#3 (permalink) Old 10-01-2011, 01:50 PM
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not sure actually, I've have the car for a almost 4 years now. its not a daily driver. prob only put on 5000mi a year. I know the previous owner wasn't very knowledgeable on BMW's so that could be the issue.

i called a transmission shop last week to ask if it could be the fluid...but of course they think its something bigger than a fluid change. and it does run smoother when its warmed up, other wise it takes a while to shift when running cold.
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#4 (permalink) Old 10-01-2011, 05:59 PM
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Take it to a reputable specialist Auto Trans shop and get fluid and filter change. Make sure that they have the equipment to extract the oil from the torque converter as well as just draining the gearbox pan. This may solve a variety of seemingly unrelated issues as well as what you are describing.


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#5 (permalink) Old 03-20-2012, 12:56 AM
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80K to 100K miles is when these tranny's start acting up, life time oil change is when the transmission takes a $hit. Drop the trans pan, let the oil pour out, change the filter, 40.00 bucks for the one made in Germany or 10.00 bucks for the one made in China. They both are the same filters, get a full synthetic ATF and add a bottle of lubeguard. New pan gasket and about 8 to 10 quarts of oil and your set, NOTE: Oil fill plug is in the side of the tranny and you need a bottle with a pump. The car will need to be in the air and level in neutral running to top it off. Pump the oil until it starts to dribble out of the fill hole and your done. Or just take it to the shop and get violated which ever is easier !



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#6 (permalink) Old 03-21-2012, 04:21 PM
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Liking it


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#7 (permalink) Old 03-25-2012, 10:19 AM
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Smile

Its the weirdest thing, i just put on new tires ,and it starting shifting normally again...
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#8 (permalink) Old 03-25-2012, 11:16 AM
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Service the Tranny anyway ! Just for your peace of mind... Yes it is strange about the tyres!! They must have worn unevenly ?


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#9 (permalink) Old 03-26-2012, 01:00 PM
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Ill definitely get it serviced regardless. But yeah, my front right control arm was worn out. it had an uneven wear pattern, Its my second control arm in 2 years! Alot of crap roads out here idk if that'll have anything to do with it =/
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#10 (permalink) Old 04-14-2012, 12:07 PM
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The 7 series BMW seems to be a real exotic car, lots of quirky little things that effect other things on this car. I for one would service the transmission its easy to do yourself or if not take it to a transmission shop. Tire wear was a factor on my AWD Denali pickup, I'm not sure how it would effect our cars ? But, there's always something new to learn about BMW's. Keep us posted about the outcome.




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