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#1 (permalink) Old 09-15-2008, 10:38 PM
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High pitch noise from transmission

It seems that i get a high pitched noise from my engine or transmission. its a 1998 e39 with 60k miles on it. at 65mph-75mph i get a noise likes someone is vacuuming next door form the engine compartment. it is louder in 5th gear, and not so loud in 4th gear, but only between that speed. It does not seem to be connected to the rpm because it make the noise in different gears. im worried it seem to be getting louder. anyone????? also what mileage do u change water pump???? thx
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#2 (permalink) Old 09-16-2008, 10:32 AM
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Sounds to me like, the rear diff, the sound will travel through the whole car.

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#3 (permalink) Old 09-16-2008, 09:07 PM
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get an oil change maybe???
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#4 (permalink) Old 09-17-2008, 05:35 AM
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Yea go for that first and change the gearbox oil at the same time, If it still does it I would say your diff is shot

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#5 (permalink) Old 09-19-2008, 10:06 PM
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i forgot to mention that it only does when i push the acceleration at those speeds, if i let go it goes away completely
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#6 (permalink) Old 09-19-2008, 10:11 PM
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what does a shot diff cost??? also what about the water pump when do u have to change it, does bmw have a timing chain or timing belt???
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#7 (permalink) Old 09-20-2008, 03:00 PM
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i had the same problem with my Auto. if you have an auto gearbox, change the oil and filter. then check again. if symtoms persist, (or if u get this sounds at these speeds whatever gear you are in then goto the diff) changed my oil and filter and shhHhHhhhh!!! sound went away
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#8 (permalink) Old 09-20-2008, 03:07 PM
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Quote:
Originally Posted by pulafets View Post
It seems that i get a high pitched noise from my engine or transmission. its a 1998 e39 with 60k miles on it. at 65mph-75mph i get a noise likes someone is vacuuming next door form the engine compartment. it is louder in 5th gear, and not so loud in 4th gear, but only between that speed. It does not seem to be connected to the rpm because it make the noise in different gears. im worried it seem to be getting louder. anyone????? also what mileage do u change water pump???? thx
What kind of tranny does she have?? Sounds like a manual!
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#9 (permalink) Old 09-21-2008, 12:13 AM
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yes it is a manual and the sound only comes on if i accelerate if i let off the pedal at that speed it goes away?? if it were the diff it would sound even if i did not accelerate. right??
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#10 (permalink) Old 09-21-2008, 04:09 AM
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Yes thats correct, sounds more like a pilot bearing noise or possibly input shaft bearing noise. Make sure your tranny has fluid in it
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