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W126 replacement transmission?

  
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Per Erik Jorde

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Since: May 26, 2008
Posts: 2



(Msg. 1) Posted: Mon May 26, 2008 10:01 am
Post subject: W126 replacement transmission?
Archived from groups: alt>auto>mercedes (more info?)
Hi,

After 460000km my 1981 380SE have developed som transmission problems.
First, it slips between 2. and 3. gear when accelerating slowly or
moderately (but not hard). Second, in reverse, it moves but feels like
the brakes are on (not a problem when the car is cold). I have tried
changing oil and filter but to no avail. Any clues?

Rather than investigating in an expensive repair I think maybe I
will swap the transmission with another W126. There seems to be
different transmission versions (mine is a 722.301): are they
interchangable? Specifically, should I be able to use one from a
1988 500SEC in my car?

pej
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Per Erik Jorde

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Tiger1

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Since: Jan 07, 2004
Posts: 1224



(Msg. 2) Posted: Mon May 26, 2008 7:57 pm
Post subject: Re: W126 replacement transmission? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
Seems like you are located in Europe. I would highly recommends getting 1984
or 1985 380SE transmission. They start off first gear and that is a major
difference. They also has the latest valve body for 380SE model year.

The newer W126 transmission has a different ratio and starts off second
gear... which would make the car sluggish.

However, all W126 transmission can be rebuilt to start off on first gear.
The modification is in the valve body itself.

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Per Erik Jorde

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Since: May 26, 2008
Posts: 2



(Msg. 3) Posted: Tue May 27, 2008 10:08 am
Post subject: Re: W126 replacement transmission? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
"Tiger" <tiger0002 DeleteThis @hotmail.com> writes:

> Seems like you are located in Europe.

Yes.

> I would highly recommends getting 1984
> or 1985 380SE transmission.

OK. I think I can get hold of a 1984 model. Only problem is that it
has been standing parked for the last 2 or 3 years, and that make me a
bit sceptical.

> The newer W126 transmission has a different ratio and starts off second
> gear... which would make the car sluggish.

My car already starts off in 2. gear. This is an early (pre-September
1981) European version with high compression (11:1, IIRC), high
octane, and reasonable high performance (218hp).


pej
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Per Erik Jorde
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Tiger1

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Since: Jan 07, 2004
Posts: 1224



(Msg. 4) Posted: Tue May 27, 2008 10:49 am
Post subject: Re: W126 replacement transmission? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
Newer transmission also has some electronics to it... so it is best to check
with a MB transmission specialist on which one is better for your car.

Wow... that's alot of horsepower... my USA version had only 155HP.

I am assuming you are getting an used transmission... it is a gamble... look
at the odometer and see what mileage it has... if it is high as in 300,000
km... then it is reasonable to think that transmission maybe on its last leg
if the body is intact... no accident.

If the car been in accident and has higher mileage... like 400,000 km...
then it is possible the transmission is already rebuilt.

If you are getting the transmission dirt cheap, then it might be worth the
gamble... I think most salvage yard gives you some warranty that it works.

Also smell the transmission fluid, if it is burnt and dark, you know it is
bad.
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perik

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Since: May 27, 2008
Posts: 1



(Msg. 5) Posted: Tue May 27, 2008 11:14 pm
Post subject: Re: W126 replacement transmission? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
"Tiger" <tiger0002 DeleteThis @hotmail.com> writes:

Tiger, thanks for your advice!

> Newer transmission also has some electronics to it... so it is best to check
> with a MB transmission specialist on which one is better for your car.
>
> Wow... that's alot of horsepower... my USA version had only 155HP.
>
> I am assuming you are getting an used transmission... it is a gamble... look
> at the odometer and see what mileage it has... if it is high as in 300,000
> km... then it is reasonable to think that transmission maybe on its last leg
> if the body is intact... no accident.
>
> If the car been in accident and has higher mileage... like 400,000 km...
> then it is possible the transmission is already rebuilt.
>
> If you are getting the transmission dirt cheap, then it might be worth the
> gamble... I think most salvage yard gives you some warranty that it works.
>
> Also smell the transmission fluid, if it is burnt and dark, you know it is
> bad.
>
>

pej
--
Per Erik Jorde
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