Diff. Swap - Mercedes-Benz Forum

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post #1 of 33 (permalink) Old 10-26-2014, 10:17 AM Thread Starter
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Diff. Swap

I have been searching the forums about the long time talked about 2.88:1 differential swapping into the 300se/sel rear end. I see some talk about it and some one will say someone has done it.. but no real info about how it worked out or pictures or anything.

Since its been a few years since those discussions. I thought id ask if anything has change or if anyone could say if its worth doing it.

Have any of you driven one with the conversion?

I am a MB Tech at my dealer and have the tools/rack/resources to do the swap if I want.

Would the bottom end torque suffer THAT much if I swapped in the sd/sdl 2.88:1 diff. In (if I could find one) and did the first gear start mod?

Open to comments, im not looking for tons of power just lower rpms at highway without turning my already underpowered car in to the dreaded 240D. Thanks.
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post #2 of 33 (permalink) Old 10-26-2014, 05:09 PM Thread Starter
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No one eh?
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post #3 of 33 (permalink) Old 10-26-2014, 05:23 PM
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did you pm the folks in the old threads?


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post #4 of 33 (permalink) Old 10-27-2014, 07:40 AM
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doing much the same...

...at least, losing the current diff in the 300SE I'm turning into a 300SD - well aware that the '85 is a Gen 1 and won't fit the Gen 2 chassis, but fortunately both are antilock diffs. Will keep you posted..

Just say no to sparkplugs[SIGPIC]
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post #5 of 33 (permalink) Old 10-27-2014, 12:30 PM Thread Starter
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Well which cars had the 2.88:1 diff? The 300SD/SDL and the 350SDL? Or no.
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post #6 of 33 (permalink) Old 10-27-2014, 04:12 PM
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Correct me if I'm wrong, but the physical dimension of the differential on the 300SE/SEL's are smaller than on the V8's. I think they might have different half-shafts as well (lengths). So you may have to think about swapping differentials and half-shafts together.
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post #7 of 33 (permalink) Old 10-27-2014, 05:36 PM
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Not sure about the 300, but the 2.88 is definitely the 1.1liter pumpkin, with the half shafts secured internally with the C-clips.
What pain in the ass, compared to the 1.3 liter pumpkin with the external mounting.
Btw, the 2.88 is available with ABS or no ABS.
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post #8 of 33 (permalink) Old 10-27-2014, 05:40 PM
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post #9 of 33 (permalink) Old 11-01-2014, 06:21 PM Thread Starter
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Well I dont think the v8s will work. I was thinking more along the lines of the diesel 126 car differentials since the gearing is closer.
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post #10 of 33 (permalink) Old 11-01-2014, 09:03 PM
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Quote:
Originally Posted by AlexHasA300SEL View Post
I have been searching the forums about the long time talked about 2.88:1 differential swapping into the 300se/sel rear end. I see some talk about it and some one will say someone has done it.. but no real info about how it worked out or pictures or anything.

Since its been a few years since those discussions. I thought id ask if anything has change or if anyone could say if its worth doing it.

Have any of you driven one with the conversion?

I am a MB Tech at my dealer and have the tools/rack/resources to do the swap if I want.

Would the bottom end torque suffer THAT much if I swapped in the sd/sdl 2.88:1 diff. In (if I could find one) and did the first gear start mod?

Open to comments, im not looking for tons of power just lower rpms at highway without turning my already underpowered car in to the dreaded 240D. Thanks.
Don't know if you mean the 2.82 diff actually, the 2.88 never existed as a diff for any w126 so far as I am aware, but it
may have been available for the m103 6 cylinder engines such as the 280 SEL/SE/300SE/SEL with that diff. (Very peppy! (at least in the '85 280SE euro I test drove around San Francisco and around and on Twin Peaks long ago...) though that one probably had a first gear start, I don't know.

A 2.82 diff could swap into a w126 pretty easily but these days they are as rare as hen's teeth.

That said, it is a good mod, and in fact about a dozen+ years ago Carl Genberg, down in Glendale, Ca at the time, ditched the factory 2:47 LSD in his 560SEC, and put in a 2.82. I got a ride in it a couple of times, and WOW !!!!!!! what an experience and an

improvement THAT made. Easy to chirp the tires from a start every time, on Carl's 560 SEC LIKE THAT Especially mated to a first gear start unit that Carl was then selling, to bw members back around 2002-2003. In fact we had a benzworld FGS install party, about 6-7 of them put in out 560SECs in one day at a member's home in San Jose. Most of us have since dispersed.

But then I myself scored a more mild 2.65 diff from a junked AMG 560SEC and had it shipped from the seller in Atlanta, to me out here.

And I can SURE tell you THIS:the combo of the FGS module, along with the 2:65, hooked up to a 300hp 560 sec euro engine, with a Remus muffler and a set of true w126AMG headers and downpipes, REALLY *is* worth it. This picture is BEFORE the front and rear euro bumpers were added.



Took me a long time to find all this, but I sure do love it!

I'm certain you would too. The toughest part, of course is just *finding* all this stuff.

Patience, luck peristance money and good luck will bring it to you.

Jim
<--- superschnelle 300 hp 10:1 ECE euro HV, Hochverdichtung = high compression (11/2011) ... Wie im Freien Fall. Nur horizontal.


"I swear to god, it's like I live in a trailer of common sense, and stare out the window at a tornado of stupidity." >'='<

Last edited by cascade; 11-01-2014 at 09:25 PM.
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