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Old 02-16-2015, 01:09 AM   #1
e46dub
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Blew my diff? Few questions 328i e46

I have a 2000 328i and on the highway doing 60 had a slight loss of power in 5th gear that brought me to 53mph in a few seconds. Downshifted and started to smell something. Pulled over rear end smoking. Smoke stopped drove again and from 0-15 no sound anything higher it got louder. Vibration and sound from I believe rear center. After looking under the car the front of the diff facing front of car was wet and it leaked a few drops within 5-10 minutes.

This is leads me to believe the rear diff is toast? Car has 220k in it. I got it at 139k and never checked rear end. I ordered a 3.38 from a 330i auto. I am 5 speed. What do I need for the swap? I understand I will need to switch driveshaft flange. But do I need any special tools? I couldn't find any 328i related threads. If you can link me to a nice one other than the main diff swap diy that's great too.

Looking forward to the 3.38 though
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Old 02-16-2015, 01:10 AM   #2
e46dub
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Also sound is only made when clutch is applying power. Neutral revving no sounds!
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Old 02-16-2015, 03:38 AM   #3
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Bump
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Old 02-16-2015, 03:58 AM   #4
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hmm, i'm not saying it's your diff but here is the link for what tools to expect to need and the DIY. yep you will need to swap the input flange too. i've posted several times how to do that so just search my posts about it.
http://www.bokchoys.com/differential/diy_diff.htm
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Old 02-16-2015, 10:15 AM   #5
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Al you need is to swap flange. Get a pry bar and it just comes right off. Easy swap assuming it's your diff. I put in a 3.46 and it goes a lot faster but only goes to 130 mph before running out of rpm
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Old 02-16-2015, 10:36 AM   #6
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Originally Posted by e46dub View Post
I have a 2000 328i and on the highway doing 60 had a slight loss of power in 5th gear that brought me to 53mph in a few seconds. Downshifted and started to smell something. Pulled over rear end smoking. Smoke stopped drove again and from 0-15 no sound anything higher it got louder. Vibration and sound from I believe rear center. After looking under the car the front of the diff facing front of car was wet and it leaked a few drops within 5-10 minutes.

This is leads me to believe the rear diff is toast? Car has 220k in it. I got it at 139k and never checked rear end. I ordered a 3.38 from a 330i auto. I am 5 speed. What do I need for the swap? I understand I will need to switch driveshaft flange. But do I need any special tools? I couldn't find any 328i related threads. If you can link me to a nice one other than the main diff swap diy that's great too.

Looking forward to the 3.38 though
Swapping the driveshaft flange is extremely difficult. It'd be easier to source a 330 driveshaft.
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Old 02-16-2015, 11:18 AM   #7
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From what I've read swapping the flange seems simple
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Old 02-16-2015, 11:28 AM   #8
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reading and doing the actual job is not the same thing.
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Old 02-16-2015, 11:31 AM   #9
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Very doubtful a 330 driveshaft would work on a 328. Since you're chiming in have you done it? I'm speaking of swapping flanges
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Old 02-16-2015, 11:43 AM   #10
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Very doubtful a 330 driveshaft would work on a 328. Since you're chiming in have you done it? I'm speaking of swapping flanges
You have to reset the pinion/ring gear backlash if you put a new flange in. If you do it wrong, you'll end up needing a new diff again. Sourcing a 325 diff would be better. Swapping the output flanges is VERY easy, but the input is another matter.

Why doubtful? A 330 shaft will likely work because it's still the same diff body and the GM 5L40E on many 330s. But I'm not entirely sure. The Lengths ARE different.
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Old 02-16-2015, 12:38 PM   #11
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I am not looking to use a 330i driveshaft. That's just too much money to do. People have used the 3.38 on the 328i by swapping flanges. Could it be easier to take the diff to a shop to swap input flanges?
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Old 02-16-2015, 12:58 PM   #12
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didn't i say i have posted how to swap input flanges several times?! now just for principle i can't post it until you search for info.

the quick of it is you unbend the locking collar off the nut and make a mark with a sharpie on the nut and shaft tip where they intersect. count the number of turns to take off. swap flange and put nut back on EXACT same number of turns and align back to the mark. Put locking collar on.
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Old 02-16-2015, 12:59 PM   #13
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didn't i say i have posted how to swap input flanges several times?! now just for principle i can't post it until you search for info.



the quick of it is you unbend the locking collar off the nut and make a mark with a sharpie on the nut and shaft tip where they intersect. count the number of turns to take off. swap flange and put nut back on EXACT same number of turns and align back to the mark. Put locking collar on.

:p
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Old 02-16-2015, 01:54 PM   #14
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In regards to the spinning force is this capable of doing with a torque wrench? I'm trying to figure out if this would be better taken to a shop to get the flanges switched or do it myself. I've had experience doing suspension and engine work but have yet to work on trans or differentials. Are there any special tools to take the clip off? Do I need a powerful air gun to remove the nut? These are questions in trying to figure out before moving forward. If I were to get a 3.46 would it really be much more simple? Like a remove one diff bolt in new one? I liked the idea of 3.38 for highway but 3.46 is ok
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Old 02-16-2015, 02:11 PM   #15
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Also could it be anything other than the diff? When driving I could hear the winding of what I thought the diff would sound like by rpms
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Old 02-16-2015, 02:18 PM   #16
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If it increases in volume or pitch with speed (not RPM) then it's probably the diff.
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Old 02-16-2015, 02:19 PM   #17
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Ok yeah. It sounded like every gear it would get louder and louder at 45 it was way loud. Tone would change when letting off gas in gear. Still loud though

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Old 02-16-2015, 02:21 PM   #18
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Does it sound similar to this?

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Old 02-16-2015, 03:00 PM   #19
e46dub
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Yeah but louder and vibration. Hard to tell from video but sound was very similar but he had an auto so it wasn't changing during shifts etc
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Old 02-16-2015, 03:06 PM   #20
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Yeah that was me pulling onto the highway in 5th gear. I had to get a new Diff.
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