[W126 Coupe] Help! : diff ratio's

[Divov]

The unhappy news is that the diff from a 350SE is completely different to 
the SEC diff. Amen.
Alec D

----- Original Message ----- 
From: "Satish Tummala" <satish at tummala.net>
To: "Mercedes Coupes Mailing Lists" <mbcoupes at mbcoupes.com>
Sent: Sunday, April 29, 2007 6:28 PM
Subject: Re: [W126 Coupe] Help! : diff ratio's



> Also, there is the 1.4 liter unit used in 12 cylinder models

>

> -----Original Message-----

> From: "Steve Nervig" <dakota at mac.com>

> To: "Mercedes Coupes Mailing Lists" <mbcoupes at mbcoupes.com>

> Sent: 4/29/07 9:18 AM

> Subject: Re: [W126 Coupe] Help! : diff ratio's

>

> Alex, first off, let me say that I am not an MB diff expert, so

> verifying what I say would be a good thing.

>

> My understanding is that MB has generally had two sizes of

> differential housings and gears. There is a smaller size (1.0 or 1.1

> liter oil capacity, 185 mm dia ring (crown) gear) and a larger size

> (1.3 liter oil capacity, 210 mm dia ring gear). There also appears to

> be some changes within these two categories. See Job 35-500 for some

> visual clues on differences.

>

> My belief is that the two sizes are not interchangable as a unit in a

> particular chassis because of mounting configurations and that the

> gears are not interchangeable between housing sizes.

>

> I've heard that the smaller size generally came on cars with less

> than 200 HP and the larger size on cars over 200 HP.

>

> I've also been told that changing or installing a gear set in a

> housing requires a special tool jig set and can't be done properly

> without it. In the past, I've set up rear ends (non-MB) with shims

> and machinist blue, but apparently this isn't how an MB rear end is

> set up. Something about crush washers on the pinions seals. How an

> improper set up would manifest itself, I do not know. Maybe you could

> get by with it for limited racing, and the only problem would be a

> leaky pinion seal. Maybe not.

>

> So apparently, the trick is to find a suitable donor car that has the

> same configuration housing and replacing the whole thing, without

> opening up/changing the gears.

>

> I'm sure there is someone who can either confirm or poke holes in the

> above statements.

>

> Regards,

> Steve Nervig

>

>

> On Apr 29, 2007, at 3:54 AM, Divov wrote:

>

>> This website is just great!  Without it I would be floundering

>> around in the dark.

>> Thanks to the various inputs, I have located a 3:46 diff from a 80

>> 350SE saloon and the best of it is that it is available free,

>> gratis & for nothing!!

>> Now, what I am scheming is the following:

>>

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