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In the shop at Pelican
Join Date: Aug 2002
Location: Los Angeles, CA
Posts: 10,459
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Need help asap BMW diff. related
Long story short,
I sold my BMW to a guy in L.A. and the input shaft bearing on my diff went out on the drive down here. It's a 85 635csi with a 3.46 LSD Went to the wreckers and got a open 3.45 off what he said was a 325 (a LSD 3.73 was $100 more), although when I got home, I see the diff cover has a completely different rear cover and housing. The old diff cover will not line up, although the output shafts do. I'm suspecting it's out of a E36 based on some basic research of part numbers on Pelican. Anyone know what this is off of? Diff tag reads 345 N5701. The cover reads 1214110 I've included a pic of the diff along with my original cover I got to have this thing changed out by Monday Guess I'm back there tommorow with more money, grrrr.....  
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06-16-2006, 06:57 PM
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Registered
Join Date: Jan 2005
Location: Grand Haven, MI
Posts: 225
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The E30 and E24/E28 differentials are interchangeable. You just have to exchange the stub axles and cover. Looks like you got the wrong differential.
Too bad you aren't closer. I've got a standard 3.46 open differential in my garage thats just taking up space. It came off my 635 when I swapped in a 3.73LSD.
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95 540i/6 89 R100RS |
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06-17-2006, 05:30 AM
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Banned
Join Date: Mar 2005
Location: Travelers Rest, South Carolina
Posts: 8,795
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It looks like you have a diff out of an E30 4 cylinder car, they're a small diff. In order to get a diff that will fit your E21 6-series, you need one from an E30 6-cylinder car, an E23 7-series, an E28 5-series, or another E21.
Then it's a simple matter of swaping the diff covers, swapping the stub axles (and maybe renewing the side seals, cheap), bolting it in (use a tranny jack), and hooking up the speedometer sensor. Pulling the broken diff apart to replace the bad part requires a rebuild, at around $800.00. Not the thing to do. |
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06-17-2006, 06:04 AM
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