1989 W126 300SE Lsd???

[Strand79]

Hello, been reading in this forum a long time, and with envy for all the cool projects some of you guys have.
I have a 300SE that in time will get efi, 722.6 trans and a turbo.
So now I am gathering info on the things I need to purchase.
So now to my question: do any one of you know what diff will fit my car?
I have heard that the 210mm is very strong but I cant find info if that will fit.


The picture is fromthe paintshop, some restoration work has been done.

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[Frank Reiner]

Originally Posted by Strand79

Hello, been reading in this forum a long time, and with envy for all the cool projects some of you guys have.
I have a 300SE that in time will get efi, 722.6 trans and a turbo.
So now I am gathering info on the things I need to purchase.
So now to my question: do any one of you know what diff will fit my car?
I have heard that the 210mm is very strong but I cant find info if that will fit.

The 210mm diff was used in V8 W126 cars. It is a bolt-in. It requires that the axle shafts from the V8s also be used (different CV joints, shorter shafts).

[Strand79]

Hello Frank, thanks for your answer.
Do you know if it has to be from a gen 2 car?


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[Frank Reiner]

Originally Posted by Strand79

Hello Frank, thanks for your answer.
Do you know if it has to be from a gen 2 car?

Since yours is a Gen II, yes it will require a Gen II V8 diff, or a complete rear subframe w/diff from a Gen I. The mounting of the diff to the subframe is different for Gen I & Gen II.


Short of a boosted engine, the 185mm diff is likely sufficient, and offers a wider selection of ratios.

[Strand79]

Ok, the easiest solution for lsd would be the best.
But it need to be strong, going for ca 400-450hk

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[atypicalguy]

Originally Posted by Strand79

Ok, the easiest solution for lsd would be the best.
But it need to be strong, going for ca 400-450hk

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Nobody ever seems to blow up the 185 diff or shafts on street tires. I would focus on a new driveshaft.

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[Strand79]

My knowledge on diffs are very limited so I am going to ask for some more help.
Where can I find a 185mm lsd diff?
Tried searching for one with no luck

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[Frank Reiner]

Originally Posted by Strand79

My knowledge on diffs are very limited so I am going to ask for some more help.
Where can I find a 185mm lsd diff?
Tried searching for one with no luck

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They were supplied in the 2.3/2.5L 4-valve equipped 190Es.

[Strand79]

Originally Posted by Frank Reiner

They were supplied in the 2.3/2.5L 4-valve equipped 190Es.

Thank you Frank.

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[fonzi]

Originally Posted by Frank Reiner

They were supplied in the 2.3/2.5L 4-valve equipped 190Es.

The diff in my 2.3 5-speed 1985 190e in tiny. I’m pretty sure it is not LSD, but it’s a data point that makes me think, “Really?”.


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[Roncallo]

The gen 2 diffs are available all over the place any late model 126 V8 or 107 will have them. The trick will be getting a different gear ratio unless you are happy with a 2.47, which you will not be with 6 cyl. So the only options are to get a 126/107 diff 1986 and later. Find a gear set form another car that will fit and get either a European carrier also used in the US spec 300 SDL's with ADS or a Quaif or Waveteck aftermarket carrier.

You basically need to make the diff you want from pieces of 3 cars. For me the 2.82 gearset and carrier from the 300SDL stuffed into my 107 housing is what I need and am working on right now.

[Strand79]

Originally Posted by Roncallo

The gen 2 diffs are available all over the place any late model 126 V8 or 107 will have them. The trick will be getting a different gear ratio unless you are happy with a 2.47, which you will not be with 6 cyl. So the only options are to get a 126/107 diff 1986 and later. Find a gear set form another car that will fit and get either a European carrier also used in the US spec 300 SDL's with ADS or a Quaif or Waveteck aftermarket carrier.

You basically need to make the diff you want from pieces of 3 cars. For me the 2.82 gearset and carrier from the 300SDL stuffed into my 107 housing is what I need and am working on right now.

Thank you Roncallo.
Shame there isn't more plug and play parts for these cars.

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