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06-10-2018, 02:02 PM
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#1
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Ask me about how I answered the question "How fat is TOO fat?"
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Troubleshooting diff noise, 3.15 replaced with 3.64
Hey everyone,
I just spent my Saturday replacing my 3.15 with a 3.64 in my 330i. I've swapped out the fluid and output shaft seals to make sure its completely sealed. After installing the refreshed diff and going for a drive the first thing I noticed was a whirring noise when letting off the throttle at low speeds. When accelerating or driving at higher speeds (so in third gear and onwards at this point) the noise isn't present.
So putting on my thinking cap I've jacked the car back up and inspected it further. While under the car I've noticed some backlash (play) from the driveshaft connecting to the input flange to the diff and when rotating the driveshaft it reproduced that same noise.
My question, with the whirring noise and the backlash present do you think its the bearings in the input side that are bad or is it something more? Also, is it dangerous to drive with this? I have a trip coming up next weekend and debating swapping my old diff back in.
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Quote:
Originally Posted by toyota86
the guys over at lambo vancouver said there are 60-70 pre-orders already. don't quote me though.
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06-10-2018, 02:30 PM
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#2
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14 dolla balla aint got nothing on me!
Join Date: Mar 2014
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Limited slip?
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06-10-2018, 02:31 PM
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#3
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Ask me about how I answered the question "How fat is TOO fat?"
Join Date: Apr 2005
Location: Vancouver
Posts: 8,142
Thanked 4,146 Times in 1,143 Posts
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Neg, just upped the gearing
__________________
I'm so stance my roof rack got a roof rack
░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░
Current
e92 335i 6MT RB Twos Turbos FBO
Former
e90 330i 6MT
e46 330ci 5MT - RIP
uc1 5AT
em2 5MT
db7 5AT - RIP
Quote:
Originally Posted by toyota86
the guys over at lambo vancouver said there are 60-70 pre-orders already. don't quote me though.
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06-10-2018, 02:34 PM
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#4
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14 dolla balla aint got nothing on me!
Join Date: Mar 2014
Location: im over here!
Posts: 662
Thanked 365 Times in 175 Posts
Failed 87 Times in 22 Posts
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hmm, I'm running 3.73 lim. slip on my BMW and there's some light whirring sounds at low speeds that's commonly been considered "normal"
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06-10-2018, 05:54 PM
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#5
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I contribute to threads in the offtopic forum
Join Date: Feb 2008
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Can you specify exactly what was replaced? Did you swap the guts in your diff or replace the diff? If you swapped the guts what exactly did you install/replace?
Judging by the symptoms I'm going to suggest that there is excessive clearance somewhere... sounds like a backlash issue.
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Originally Posted by jasonturbo
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06-10-2018, 06:02 PM
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#6
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Ask me about how I answered the question "How fat is TOO fat?"
Join Date: Apr 2005
Location: Vancouver
Posts: 8,142
Thanked 4,146 Times in 1,143 Posts
Failed 1,392 Times in 247 Posts
|
Bought an entire 3.64 diff, replaced the two seals on the output shafts. Everything else left as it is.
__________________
I'm so stance my roof rack got a roof rack
░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░
Current
e92 335i 6MT RB Twos Turbos FBO
Former
e90 330i 6MT
e46 330ci 5MT - RIP
uc1 5AT
em2 5MT
db7 5AT - RIP
Quote:
Originally Posted by toyota86
the guys over at lambo vancouver said there are 60-70 pre-orders already. don't quote me though.
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06-10-2018, 09:24 PM
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#7
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Ready to be Man handled by RS!
Join Date: Mar 2004
Location: van
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Is the drive shaft two piece?
If so, was it lined up again as it was installed from OEM? If its off by more than a few splines it could cause noise or other vibration issues. There should be some markings from OEM as it was balanced.
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