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Old 04-30-2006, 07:17 PM   #1
Jon@Bimmersport
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Differential rebuilds

I was thinking of rebuilding a diff, its LSD. How much would that cost to do, locally? What can i do to beef it up to handle more power? Also, would it be cheaper to order the rebuild kit from diffsonline or do it locally, considering diffsonline rebuild kit is 520usd shipped...its using stock parts. I want to keep the stock lock up ratio, but is there any upgradable parts (gearing, bearings, etc)?
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Old 04-30-2006, 09:53 PM   #2
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Why do you want to rebuild it? Does the LSD not work anymore? Is it making noise?
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Old 04-30-2006, 10:47 PM   #3
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yes it makes like a wobbling noise, sounds like a bearing. my shaft seals are leaking as well.
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Old 04-30-2006, 10:51 PM   #4
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so get another lower km used one, it'll probably be cheaper for you.
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Old 05-01-2006, 02:22 AM   #5
Jon@Bimmersport
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well a used 3.15 costs 400ish, so why not get it rebuilt for maybe the same price or a bit more money?
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Old 05-01-2006, 03:52 AM   #6
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I rebuilt an e39 335i LSD a few months ago.. no clue what I was doing. It's a very messy process, and it took me almost a whole day to figure things out, but I'm clueless to this kind of stuff, especially without any instructions. I did it just for the learning experience. When you crack the diff open, you'll see it's a very VERY simple mechanism inside. The hardest part is cracking the thing open. After that it's just swapping parts over.

In either case, Bimmersport has a trusted differential rebuilder that he can send it to. I'm sure RMP does as well. And of course, most shops that rebuild transmissions can do your diff too.
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