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Old 10-07-2010, 05:30 PM   #1
Forcefed M3
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Exclamation Urgent! E46 M3 guys check your differential bolts!

While my car was in the shop getting the transmission replaced, the mechanic noticed that one of my differential bolts was missing and another one was halfway backed out. BMW doesn't put thread lock on these bolts! WTF. It has happened to other people as well. Easy fix with red lock tight. That could really suck to look in your mirror and see your 2 back wheels and your diff changing lanes without you.
http://m3forum.net/m3forum/showthread.php?t=115461
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Old 10-07-2010, 06:04 PM   #2
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I guess it's a good thing HpF is changing my diff. They will fix it.
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Old 10-07-2010, 06:05 PM   #3
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Couldn't wait until HPF is able to build the transmission ?

You got a new tranny or used ?
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Old 10-07-2010, 06:20 PM   #4
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Couldn't wait until HPF is able to build the transmission ?

You got a new tranny or used ?
Used, my old one will head there for the new syncros.
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Old 10-07-2010, 06:25 PM   #5
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This is a must! I just had the exact same issue a couple weeks ago. These should be checked every time you change you oil.
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Old 10-07-2010, 07:30 PM   #6
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That was what have caused my clunking noice awhile back
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Old 10-07-2010, 07:42 PM   #7
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That was what have caused my clunking noice awhile back
hmmm i need to check mine ASAP, i had my os giken installed shortly after you. if yours had already come lose, mine might have as well.
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Old 10-07-2010, 08:16 PM   #8
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Puta cheeet!!! I'll check mine out tomorrow, I'll be under the car doing some suspension work. Thanks for giving a heads up.
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Old 10-07-2010, 08:22 PM   #9
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Which bolts were loose on yours. Half shaft or one of the three mounting bolts.

I'm guessing the half shaft bolts. See this often on stock cars.
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Old 10-07-2010, 08:29 PM   #10
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Which bolts were loose on yours. Half shaft or one of the three mounting bolts.

I'm guessing the half shaft bolts. See this often on stock cars.
Mounting bolts on 3 of us so far
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Old 10-07-2010, 08:34 PM   #11
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Mounting bolts on 3 of us so far
Which ones.
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Old 10-07-2010, 08:52 PM   #12
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Which ones.
Mine were the three bolts that mount the diff to the sub frame. Two of the bolts were missing and the last one was half way out. It damaged my sub frame and we had to re-tap it.
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Old 10-07-2010, 09:23 PM   #13
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thanks checking mine tonight!
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Old 10-07-2010, 09:39 PM   #14
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Mine were the three bolts that mount the diff to the sub frame. Two of the bolts were missing and the last one was half way out. It damaged my sub frame and we had to re-tap it.
Computer back up! Mine also was subframe.
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Old 10-07-2010, 09:53 PM   #15
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Mine might had broke because of this as well!
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Old 10-07-2010, 10:19 PM   #16
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Mine were the three bolts that mount the diff to the sub frame. Two of the bolts were missing and the last one was half way out. It damaged my sub frame and we had to re-tap it.
It's obvious when even one of the mounting bolts are loose, that's what I don't understand. You should have had an enormously loud clunk very early.
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Old 10-07-2010, 10:39 PM   #17
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It's obvious when even one of the mounting bolts are loose, that's what I don't understand. You should have had an enormously loud clunk very early.
I did, I had my mechanic check to see what the issue was and that's what he discovered.
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Old 10-08-2010, 12:36 AM   #18
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It's obvious when even one of the mounting bolts are loose, that's what I don't understand. You should have had an enormously loud clunk very early.
mine did also
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Old 10-08-2010, 04:50 AM   #19
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Ditto, Good Call!

My mechanic at Bavarian Specialists diagnosed mine when I complained of a loud Clunking noise, it was the three mounting bolts
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Old 10-08-2010, 05:02 AM   #20
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Guys check out my threads..........

http://forum.e46fanatics.com/showthr...049&highlight=
http://www.bimmerboost.com/showthrea...-other-updates

If you notice I changed all the bolts and the new diff bolts are different. In the end because they werent tightened to BMW spec they ALMOST came lose but thank God I felt there was something wrong and got it checked out and tightened. You'll find all the Parts in my thread. PLease change out ur diff bolts to the new design.
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