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Old 1st July 2017, 12:03 PM   #1
leejohn
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Default M3 e46 Rear Diff

could someone please recommend a good reliable garage who rebuilds or replaces diffs and how much does it cost?
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Old 1st July 2017, 12:14 PM   #2
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Don't know about any garages.

But Mrd1984 on here, rebuilt my diff for me a few months back.

Drop him a PM (although he is at Goodwood this weekend I believe).
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Old 1st July 2017, 01:17 PM   #3
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Parts for a rebuild is about 250 max. But remember the LSD itself is not serviceable. Clutches and steels are not available
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Old 7th July 2017, 09:18 PM   #4
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Thanks cossie1.

Im back now. Goodwood was good. Would you like a diff built leejohn?
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Old 4th August 2017, 09:55 AM   #5
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Quote:
Originally Posted by schooner32 View Post
Parts for a rebuild is about 250 max. But remember the LSD itself is not serviceable. Clutches and steels are not available
Interesting, so if i'm looking at totally refreshing my diff and changing final drive what are the options. Or is just replacing seals etc good enough?
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Old 4th August 2017, 10:49 AM   #6
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Quote:
Originally Posted by rusticm3 View Post
Interesting, so if i'm looking at totally refreshing my diff and changing final drive what are the options. Or is just replacing seals etc good enough?
To change the final drive you need to order a new Cwp and ring gear, option's are 3.91, 4.1, 4.44.

A refresh means new bearings (x4) and new seals (x3) and o rings (x2) and preload crush sleeve. (X1).

If you have any desire to change the final drive ratio then this is the time to do it.

Bearings should be fine but it's not that hard to change them .
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Old 24th August 2017, 09:51 AM   #7
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MrD, whats the cost of having you rebuild my diff?
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Old 24th August 2017, 10:58 AM   #8
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Its about 600 mate. depending on what oil you want and if you want to update a couple of bits.
But the end result is a freshly rebuilt diff that has a full factory spec preload and backlash reset.
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Old 23rd September 2017, 05:50 PM   #9
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That's not a bad price I might be in touch when I get get my 4.1
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Old 24th September 2017, 09:09 PM   #10
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Quote:
Originally Posted by Mrd1984 View Post
Its about 600 mate. depending on what oil you want and if you want to update a couple of bits.
But the end result is a freshly rebuilt diff that has a full factory spec preload and backlash reset.
Hi Mrd, Which parts of the diff are upgradeable ?
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Old 26th September 2017, 09:04 PM   #11
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Hi,
You can upgrade most of it.
Motorsport crown wheel and pinion (4.10, 4.44 ratios), Diffenent LSD unit (gripper, Wavetrack, Quaife).
The bearings and seals stay the same though.
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Old 27th September 2017, 07:58 AM   #12
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Just rebuilt a diff myself with 3.91 gear set and all new bearings and seals. Nice little job, definitely requires the right tools and setting up.
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Old 27th September 2017, 08:09 AM   #13
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Quote:
Originally Posted by paulclaude View Post
Just rebuilt a diff myself with 3.91 gear set and all new bearings and seals. Nice little job, definitely requires the right tools and setting up.
How do you find the 3.91?

Its a very subtle change isn't it. But still makes an improvement.
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Old 27th September 2017, 01:58 PM   #14
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Quote:
Originally Posted by Mrd1984 View Post
How do you find the 3.91?

Its a very subtle change isn't it. But still makes an improvement.
Didn't have time to fit it, but will have it in once i'm back from work. Should pair nicely with my present engine power/track use
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