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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 09-11-2012, 02:36 PM   #1
kimchristiansen
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Question rear diff question.....

I have in the last days noticed a light rumbling noise from the rear, really just a light sound....... so far. And then i remembered that i have a rear diff from my old 1990 E30 325i hidden away. Will i be able to fit this item on my 1998 E46 320i? By the way they are both manual tranmission

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Kim Christiansen Denmark

Last edited by kimchristiansen; 09-11-2012 at 02:38 PM. Reason: key-note forgotten
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Old 09-11-2012, 02:58 PM   #2
robin325ci
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I don't think it will fit. E30 and E36 diffs have different mounting points if I remember correctly
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Old 09-11-2012, 03:25 PM   #3
kimchristiansen
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But will i be able to make it fit? Just wondering
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Old 09-11-2012, 04:04 PM   #4
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Originally Posted by kimchristiansen View Post
But will i be able to make it fit? Just wondering
i've seen race teams for weight reasons "make fit" just about any rear diff with a lot of custom work.

with that said i highly doubt the E30 diff would work without costly fabrication/work. in other words it'll cost you more to "make it work" than another used one. the E30 diff is a lot heavier as well.
not to mention your 320i probably takes the small pumpkin diff on top of it.
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Old 09-11-2012, 04:13 PM   #5
shwagon
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It will not fit and you will not be able to "make" it fit and save any money.
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Old 09-13-2012, 01:36 PM   #6
kimchristiansen
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okay, thank you all for you time
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Old 09-13-2012, 02:14 PM   #7
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Of course you've checked the fluid levels and inspected bushings? There are something like 7 bushings in total...and then there's also the subframe issue. Have you inspected around your rear, rear axle carrier bushings for a tear in the sheetmetal?

Use good led flashlight...and clean up around the subframe bushings so you can see what's going on up there.

You know, I assume, to open fill plug before drain plug...and think you need a crush washer for them too. Look for leaks...could be one of the three seals or the rear gasket...mine has just started seeping slightly, but the level is fine.
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