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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 10-03-2004, 10:52 AM   #1 (permalink)
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This is Murphy from Taiwan, nice to meet everone here!!

I have a very old E34 525i(MY1990, 5MT, Europe Version), and recently I can hear a strange noise from the button of my car. And the machenics told me that is the sound of the differential, there is no safety issue but if I want to end up this noise I have to change a differential.

I find a used 1993 differential from 525i, the ratio is 3.23, but I do not know the diff ratio of my car and this 1993 used diff ratio can fit my car? Some one told me that the diff ratio of my 1990/E34 525i is 3.73, is that true? Can I use that diff?
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Old 10-04-2004, 10:15 AM   #2 (permalink)
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Murphy
check this website for further explanations. this may help you
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Old 10-04-2004, 10:40 AM   #3 (permalink)
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Originally posted by billB@Oct 4 2004, 11:15 PM
Murphy
check this website for further explanations. this may help you
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Thanks Billb....

But in your word {this website} means this BMW-Forum? I tried the key word ratio but did not work.....

Or you forgot give me the web site link??

Thank you anyway....
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Old 10-04-2004, 01:37 PM   #4 (permalink)
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go to

www.bmwe34.net

theres a list of differential ratios there. I believe the 1990 with the m20 is actually a 4.1 but could be a 3.73.

Either way , since the engines are different, the diff's are probably different too. changing to a lower ratio one would just slow the acceleration down a bit.
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