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RickNeilH
Joined: 08 Jun 2007 Posts: 25
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Posted: Wed Oct 10, 2007 1:42 pm Post subject: 98 740i tranny behavior |
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I have learned that low transmission fluid will cause a whining noise.
I am getting a whining noise but very faint and not at all offensive. Sounds kinda good actually when combined with the exhaust sound.
Also, since mornings are getting cooler, my transmission is a little stubborn on the upshift.
I figure I'll take it in to get the level checked but this is my first place to ask questions.
Any ideas?
Rick H _________________ Rick and Neil H
1995 525i
1998 740i |
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edjack
Joined: 04 Feb 2002 Posts: 3887 Location: San Jose, CA
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Posted: Wed Oct 10, 2007 8:03 pm Post subject: |
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When did you last change the fluid? If never, and you have more than 60k on the car, best to change it now.
You'll need to change it 3 times to get all the old fluid out, unless you flush it. Best to use the trans pump to do this, since a high-pressure flush is not recommended.
If you're not leaking fluid, and the last service was done correctly, the level will not go down. _________________
Ed BMW CCA member since 1987 (Nr. 62319).
'97 540i 6 speed Aspensilber over Aubergine interior. |
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druggrepp
Joined: 29 Sep 2002 Posts: 69 Location: texas
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Posted: Thu Nov 08, 2007 7:51 pm Post subject: 740 trans fluid |
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When I owned my '95 e32 it had 120k miles on it and it started whining also, Turns out the trans cooler had sprung a very small leak and that whining means you are low on fluid.
So get ready , it ain't cheap. The trans is sealed and not designed to be serviced, the fill hole is near the bottom of the trans, and when doing this you need to install a BMW oem trans filter. ABSOLUTLY don't use aftermarket filter, it will burn your trans out.You have to have a fluid pump with a long hose to pump it up to the trans, it must be done on a lift.
I refilled it 3 times until it finally toasted itself and I bought a rebuilt unit from Phoenix trans off ebay for $1000.
Also, e32 requires a special bmw fluid but your mechanic can get aftermarket fluid, esso and shell make one but it cost $200 for the trans atf.
Good luck |
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