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BMW Differential Tutorial, with pics.
07-06-2016, 09:53 PM, (This post was last modified: 07-06-2016, 09:53 PM by Mr.JT.)
RE: BMW Differential Tutorial, with pics.
(23-09-2009, 03:57 PM)Gizmo Wrote: So I thought I should educate the BMW masses with my knowledge of BMW differentials. Here goes.

Earlier BMW models were nice in the fact that gear-sets and LSD units were interchangeable. Any BMW running the Type 188 (small case) gear-sets in the diff are swappable. Same thing goes for the Type 210 (large case) gear-sets.

Type 188 cars:
All E36 models, except the 3.2lt M3.
All E30 6cyl models.
All E34 models, except the M5 and 540i.
All E32 6cyl models.

Type 210 cars:
E46 M3 and E36 4door M3.
E34 M5 and 540i.
E32 740i and 750i.
All E38 models.
E39 V8 models, could be all models but not sure.

Here are pics of 2 E34/E32 diffs, 1 E34 and 2 E36 diffs. The two large case (type 210) E32/E34 limited-slip diffs on the left. A small case (type 188) E34 diff in the centre. Two 3.15:1 limited-slip E36 diffs on the right.
[Image: SDC10811.jpg]

Here is an exploded view of the internals of a type 188 open diff.
From left to right: Two output shafts, Open center-portion, Ring gear, Speed trigger wheel, Pinion gear, Input flange, nut.
[Image: SDC10812.jpg]

Here is the type 188 E34 case, below it is the type 210 E32/E34 case. Note, small case has 6 bolts, big case has 8 bolts.
[Image: SDC10813.jpg]

Type 210 output shaft, 36mm dia. Type 188 output shaft, 30mm dia.
[Image: SDC10817.jpg]
[Image: SDC10818.jpg]
[Image: SDC10819.jpg]

With the output shaft removed you can see the limited-slip center-portion, it has the allen key hexagonal shaft.
[Image: SDC10814.jpg]

Open center-portions have a round shaft.
[Image: SDC10815.jpg]

All BMW diffs have tags saying if its limited-slip (S) and the ratio.
[Image: SDC10824.jpg]
[Image: SDC10822.jpg]

Here is the oil I use for Limited-slip diffs.
[Image: SDC10820.jpg]
[Image: SDC10821.jpg]

BMW changed the differential design on the later models with type 188 gear sets like the E46, these won't work with the type 188 Limited-slip center-portions, pity 'cos I wanted one in my 330i. The only option is from Quaife @ +R10 000...

Oh btw, the two e36 3.15:1 LSD diffs are for sale @ R1800 each. The two large case diffs are for Uber Soldat and Clutchplate.

Any questions as to what ratio your car has I can find out for you. Got any other questions?

Very informative
I will definitely take one of those 3.15 differentials

(23-09-2009, 03:57 PM)Gizmo Wrote: So I thought I should educate the BMW masses with my knowledge of BMW differentials. Here goes.

Earlier BMW models were nice in the fact that gear-sets and LSD units were interchangeable. Any BMW running the Type 188 (small case) gear-sets in the diff are swappable. Same thing goes for the Type 210 (large case) gear-sets.

Type 188 cars:
All E36 models, except the 3.2lt M3.
All E30 6cyl models.
All E34 models, except the M5 and 540i.
All E32 6cyl models.

Type 210 cars:
E46 M3 and E36 4door M3.
E34 M5 and 540i.
E32 740i and 750i.
All E38 models.
E39 V8 models, could be all models but not sure.

Here are pics of 2 E34/E32 diffs, 1 E34 and 2 E36 diffs. The two large case (type 210) E32/E34 limited-slip diffs on the left. A small case (type 188) E34 diff in the centre. Two 3.15:1 limited-slip E36 diffs on the right.
[Image: SDC10811.jpg]

Here is an exploded view of the internals of a type 188 open diff.
From left to right: Two output shafts, Open center-portion, Ring gear, Speed trigger wheel, Pinion gear, Input flange, nut.
[Image: SDC10812.jpg]

Here is the type 188 E34 case, below it is the type 210 E32/E34 case. Note, small case has 6 bolts, big case has 8 bolts.
[Image: SDC10813.jpg]

Type 210 output shaft, 36mm dia. Type 188 output shaft, 30mm dia.
[Image: SDC10817.jpg]
[Image: SDC10818.jpg]
[Image: SDC10819.jpg]

With the output shaft removed you can see the limited-slip center-portion, it has the allen key hexagonal shaft.
[Image: SDC10814.jpg]

Open center-portions have a round shaft.
[Image: SDC10815.jpg]

All BMW diffs have tags saying if its limited-slip (S) and the ratio.
[Image: SDC10824.jpg]
[Image: SDC10822.jpg]

Here is the oil I use for Limited-slip diffs.
[Image: SDC10820.jpg]
[Image: SDC10821.jpg]

BMW changed the differential design on the later models with type 188 gear sets like the E46, these won't work with the type 188 Limited-slip center-portions, pity 'cos I wanted one in my 330i. The only option is from Quaife @ +R10 000...

Oh btw, the two e36 3.15:1 LSD diffs are for sale @ R1800 each. The two large case diffs are for Uber Soldat and Clutchplate.

Any questions as to what ratio your car has I can find out for you. Got any other questions?

Very informative
I will definitely take one of those 3.15 differentials
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07-06-2016, 10:30 PM,
RE: BMW Differential Tutorial, with pics.
I doubt these are still available as the thread you replied to was posted on 23-09-2009...
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07-06-2016, 11:20 PM,
RE: BMW Differential Tutorial, with pics.
Rofl my bad
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08-06-2016, 06:16 AM,
RE: BMW Differential Tutorial, with pics.
Crazylaugh

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08-06-2016, 06:24 AM,
RE: BMW Differential Tutorial, with pics.
(07-06-2016, 06:57 PM)Gizmo Wrote:
(28-05-2016, 08:22 AM)Marnus328i Wrote: Hello gizmo .. do you still have one of them lsd's for my e36 328i .. im very intrested

I cannot reply to your PM's as you have set me on your ignore list.

Is there a possibility that a moderator can send marnus a pm to untick his ignore list?
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08-06-2016, 09:13 AM,
RE: BMW Differential Tutorial, with pics.
(08-06-2016, 06:24 AM)Gizmo Wrote:
(07-06-2016, 06:57 PM)Gizmo Wrote:
(28-05-2016, 08:22 AM)Marnus328i Wrote: Hello gizmo .. do you still have one of them lsd's for my e36 328i .. im very intrested

I cannot reply to your PM's as you have set me on your ignore list.

Is there a possibility that a moderator can send marnus a pm to untick his ignore list?

Will inquire with 1 of the Admins.


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'99 e46 328i
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08-06-2016, 09:32 AM, (This post was last modified: 08-06-2016, 09:32 AM by ChefDJ.)
RE: BMW Differential Tutorial, with pics.
Done. You can PM him now.

/o(O)(O) \ (lllllllll)(lllllllll) / (O)(O)o\
My thread - sold

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ChrisBrand
27-07-2016, 04:21 PM, (This post was last modified: 27-07-2016, 04:22 PM by gillianduplooy@gmail.com.)
RE: BMW Differential Tutorial, with pics.
Hi there, ok so im a girl
What is the cheapest way for me to fix my Diff.
Id really appreciate the help.

Regards Gillian

Or who can i take it too

Im in Cape Town Southern Suburbs.

And trying to save every penny I have.

Thanks Guys
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27-07-2016, 04:41 PM,
RE: BMW Differential Tutorial, with pics.
(27-07-2016, 04:21 PM)gillianduplooy@gmail.com Wrote: Hi there, ok so im a girl
What is the cheapest way for me to fix my Diff.
Id really appreciate the help.

Regards Gillian

Or who can i take it too

Im in Cape Town Southern Suburbs.

And trying to save every penny I have.

Thanks Guys
Brilliant mechanical workshop - +27216716834

Sent from my SM-G935F using Tapatalk

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2009 E90 330d lci MSport
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2003 E46 330d

EX:
2007 Polo 1.4 trendline
2006 E90 320d
2007 E90 320d msport Promotec + DP
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2009 Jeep Wrangler Saraha Unlimited
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Dr Evil
06-10-2016, 10:42 AM,
RE: BMW Differential Tutorial, with pics.
Hey Gizmo, Great info ,Thanks for sharing these details with everyone.
Website
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06-10-2016, 11:41 AM,
RE: BMW Differential Tutorial, with pics.
i got a leak on my e46 m3 diff i heard there is something like a mesh that needs to be reset once the diff is opened, it has to do with the backlash is that correct ?
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07-10-2016, 08:02 AM,
RE: BMW Differential Tutorial, with pics.
Hi Gizmo. Looking to pick ur brain a bit.

Just to clarify.

I've got a 3.15 in my e36 325i. I understand the 318is/320i diff is a 3.46.
Both should by 188 casings.(is this correct?)

My assumption is that it's a straight swap. Although I'd have to swap the output shafts from original diff onto the 320i diff?

Or would it be easier to to just get the 320i ring gear and build it into my original casing?

Are the propshafts the same length on the 320i and the 325i?

Is it possible to fit the gear set from a 168 case into a 188 case?

Lastly Will the diff from the 'lower' model be able to reliably handle the increased torque from the 325i?

Thanks boet.

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27-10-2016, 10:57 AM,
RE: BMW Differential Tutorial, with pics.
Hi Gizmo. Do you still have 3.15 LS diff as advertised? Please contact me. Andy 0832283941. Thanks

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08-06-2017, 12:40 PM,
RE: BMW Differential Tutorial, with pics.
Hi Gizmo. I am busy building a e36 Z3 for the track. It has an open diff which I would dearly like to convert to a LSD. Any stock available??
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26-03-2018, 04:24 PM,
RE: BMW Differential Tutorial, with pics.
Quick one guys is a Z3 M coupe a type 188 or 210? Also if i want to change out my 3.15 diff ratio would you'll suggest 3.64 or 3.91? Do i source crown and pinion from a e30?

Thanks
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11-07-2018, 06:38 PM,
RE: BMW Differential Tutorial, with pics.
(09-11-2009, 12:43 PM)Gizmo Wrote: Well, if you want a little more acceleration you can go from your 3.64 to 3.91 ratio. I can build you a 3.91:1 LSD for your E34 for R1800, shoot me a PM.
Hi

Can you assist please, I have a 325i(1988)and replaces my gearbox(Gertrag) with e 36 328i box Z something, I want to replace my diff with an LSD as the experts say my ratio will be short and I will only see 200km/h at top speed due to the gearbox ratio. Can you advise, please
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27-11-2018, 09:59 AM,
RE: BMW Differential Tutorial, with pics.
Geez. I wouldn't call this a thread revival. It's more like the second coming. Do you perhaps have a 3.15 LSD I can acquire from you? If not, where can I get one and for how muchch on average? Looking to put it in a project 328i.

Thanks.
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28-11-2018, 09:21 AM,
RE: BMW Differential Tutorial, with pics.
lol

Gizmo has been banned from the forum

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28-11-2018, 09:25 AM,
RE: BMW Differential Tutorial, with pics.
I am sure someone on here can PM you Gizmo's contact details. Thumbs

[Image: twinzsig_5365414051.jpg]
Website
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31-08-2019, 09:30 PM,
RE: BMW Differential Tutorial, with pics.
Maybe this thread can help me with a swap I'm working on.

What happens when you swap from 3:73 to 3:91 with the speedometer? I'm noticing the speedometer sender wheel is much farther inset into the case than it used to be.

My symptom is the new diff is working great but the mpg and mph are no longer functioning properly. Mph is stick at 0. Mpg moves but not accurately. Goes to 40 when I lift off the gas, goes to 0 any time I step on it.

The e34 sensor is totally different, do I need to keep the wheel inside from my 3:73?

It's about 1/2" deeper into the case through the sensor mounting hole than it was before the swap.
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