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RE: E30 Finshed M Diff cover Upgrade still a few Q's

I'm sort of new to BMW cars, but in general, driveline vibrations like you
describe are usually caused by universal joints that have lost their desire
to live or an output bushing in the transmission that is worn.  I have an
E36 and the Bentley manual describes the following causes for "Vibration
between 25 and 30 MPH" for an E36 which may be similar to an E30.

a. Front centering guide worn, or driveshaft mounting flanges out of round
or damaged

b. Universal joints worn or seized

c. Flex-disc worn or damaged

d. Center bearing rubber deteriorated

e. Sliding coupling seized

f. Misaligned driveshaft (installed incorrectly)

After reading this, I would suggest you check the center bearing rubber
since you can see it without severe disassembly.  Then if that does not
reveal a problem I would suspect the flex-disc or u-joints next.

Good luck

Mel
'97 Byzanz M3/4

- -----Original Message-----
From: [email protected] [mailto:[email protected]]On Behalf Of
Kyle Sanchez
Sent: Friday, September 07, 2001 12:12 AM
To: E30 digest; UUC BMW LIST
Subject: E30 Finshed M Diff cover Upgrade still a few Q's


Ok I put my new M coupe diff cover on my E30 Diff
tonight. Looks great and only took me about an hour
and a half to do the job. But I did this because I
thought that this would cure my problem. You see the
problem is that at around 19 to 21 MPH I get this
vibration, then after that its gone. My old bushing on
my diff was shot to s@#$ as it was off an 88 M3. I
checked my transmission mounts and they look fine. Any
things I should look for? Also when I had the cover
off i brushed my hand on the bottom of the inside of
the diff and there were a few metal shaveings, I got
them all out, is this normal wear and tear? Any help
from any one that has done this upgrade or anyone that
can offer any hints would be great.

TNA

Kyle Sanchez
CCA# 175883
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