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Topic: 3.69 Rear End in my Euro 280E? Reply to Thread
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  Topic Review (Newest First)
05-28-2019 06:50 AM
swampmonkey https://mbturbo.com/gear-ratios/

I have done this, multiple times.
there is some differences thou between them.

as @PlaneCrazy said, anything pre-1986 fit physically between the vehicles, w115/w123/w116/w126/r107 the lenght and the widht are the same.
so width and lenght of axleshafts and driveshaft wont be an issue.
(althou the rubber/mount at the rear are turned 180degrees between for example a w115 and a w123)

BUT!
The v8 differentials have a different yoke/flange, that is a lot bigger. 90 vs 110mm if i remember correctly.
Either you swap your driveshaft/cardanshaft coming from the gearbox to a bigger one, or you swap the yoke of the diff, (this is quite a procedure if you want to do it correctly, basicly total dissembly of the diff)

The axleshafts does fit between the different differentials althou different chassies have different axleshafts, so you take a 2.47 diff from a w126 380SE from 1984, and you can fit that in a w123 along with the w123 original axleshafts.
https://mbturbo.com/2-47lsd-with-722-6-1600rpm-100kmh/
like that.

Also, the big v8 differentials is a LOT heavier, so you might need an extra hand to lift it back up there.
05-28-2019 12:21 AM
PlaneCrazy Of course.

Quid pro quo

The W116 is no problem. The W126 and R107 diffs will fit if they are pre-1986 (e.g. 280SE and 280SL will fit, but 300SE and 300SL will not).

EDIT:

By implication, I'm assuming you're not looking to use V8 diffs.
05-28-2019 12:14 AM
BORG47 Are they cross-compatible with each other then? If I needed to, could I install a diff from an R107?
Simply a theoretical scenario.
05-27-2019 01:03 AM
PlaneCrazy I think those are just the casting serial numbers. The cast housings then get machined, and the appropriate gearing gets installed according to vehicle. Remember that these diffs were used in the R107, W115, W114, W116 and W126 - there were millions of these cast!
05-24-2019 08:42 AM
swampmonkey
Quote:
Originally Posted by BORG47 View Post
I'm gonna guess the production number and year, but I can't be certain. The "81" is probably the year, the rest I don't know.
i have a bunch of numbers written down at mbturbo.com, tried finding something in common to identify LSD differentials once upon a time, or atleast find if you could do it by those numbers, with the number of diffs i have had i couldnt find any logic behind it at al unfortunately.
(that page linked above)

496328 3.69 no LSD from a 240d w123
756812 3.46 no LSD from a 300d w123
830655 3.46 no LSD from a 300d w123

715609 2.65 LSD non Cat 560SE gen2

Etc etc.
05-24-2019 08:28 AM
BORG47 I'm gonna guess the production number and year, but I can't be certain. The "81" is probably the year, the rest I don't know.
05-24-2019 05:48 AM
swampmonkey
Quote:
Originally Posted by BORG47 View Post
Whoops, I meant to say 200, but a 200E would still be interesting.

Wouldn't it be funny if this car was a 200E prototype, and that was why everything is so weird about it? I figure it would have been difficult and expensive to convert a carburetted 200 to a fuel-injected 280E, so they probably tried to cut corners wherever they could.

As for the diff, do the numbers "044281" mean anything?
they probably mean something, but i havent found any usefull meaning of them.
probably a serial number/id of the diff,

https://mbturbo.com/lsd-differentials/
i tried finding if these numbers had anything to do with LSD, but found no logic behind it.
05-23-2019 08:52 AM
BORG47 Whoops, I meant to say 200, but a 200E would still be interesting.

Wouldn't it be funny if this car was a 200E prototype, and that was why everything is so weird about it? I figure it would have been difficult and expensive to convert a carburetted 200 to a fuel-injected 280E, so they probably tried to cut corners wherever they could.

As for the diff, do the numbers "044281" mean anything?
05-23-2019 02:41 AM
PlaneCrazy
Quote:
Originally Posted by christuna View Post
...there was no 200E all gas 200 (M115 or M102) were carbureted
Well...

I read somewhere that Mercedes indeed planned a 200E, with the same fuel-injected M102 as the W201 190E. But then they deemed it too expensive, and too close to the fuel-injection-only 230E in price and performance. So, if this is true, then strictly speaking there was no production 200E.
05-23-2019 12:56 AM
christuna so you have a 200 that's been converted to a 280E now we know why you have a 3.69 rear

all 200 came with 3.69

and there was no 200E all gas 200 (M115 or M102) were carbureted

nice euro bumpers and lights
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