Well - I have found the MB diesel "easter egg" - Page 2 - PeachParts Mercedes-Benz Forum

joeywarren · #1 02-09-2005, 10:02 AM

So what are we saying here? Can we post a table of "working diff swapout combinations" such as:

Source = W126, Destination=W123, ratio swap= 3.68 to 2.88, notes: difficulty / easy / things to watch out for?

blah blah.. PER success?!

So far, I am thouroghly confused as to WHAT source cars and ratios could (should) be used in my 230TE !.. I also suspect other members might be interested!

thanks!

>Joe

Californian · #2 02-09-2005, 10:32 AM

This is interesting.

What ratio does my 1992 300Sd 3.5L has ?

85drtysthbenz · #3 02-09-2005, 09:15 PM

this thread has got me all twitterpated

...sounds like something i might like to try in my 85 SD...mine has the 2.88, as opposed to breckman's former 3.07...i have a few questions about this...say i switch from my current 2.88 to the 380's 2.47 diff...what kind of increase in top speed would i see? any? i assume i would almost always need to run it in 3rd gear for city driving to keep it in a decent powerband, for anything under 40-45mph i run in 3rd now....might there be any ill effects on my transmission by doing this? would i be sacrificing much on the low end? right now im pretty satisfied with the low end power, even with starting out in 2nd a lot of the time...first gear is quick, it never runs over 3500rpm before shifting, even with WOT...i dont know what thats about...its always done it though...all other gears shift at around 4500rpm....so what seems to be the general concensus on this swap? think its worth it? a new diff isnt all that pricey, esp. a used one....i think im gonna bite the bullet and try it out, right after i get the beast back on the road...should be interesting at the least

#4 02-09-2005, 10:23 PM

"Golden Egg"

It's staring us all in the face...............wake up...........

Why do we need to start in second gear? Because first is way too low!

Was first gear intended for an entirly different rear ratio, that we don't get here in the USA.........They do refer to us as STOOPID AMERICANS!!!

Is this why the dots on the speedometer set for gear changes seem to be foolishly high, I mean, wouldn't your engine red line before it got to the first dot (approx 35 mph) probably!

What would be the right ratios if 2000 rpm is the proper shifting point for 35 mph in first gear, and dots for second, third and fourth, respectively?

coachgeo · #5 01-26-2004, 06:54 PM

Quote:

Originally posted by DslBnz
R107....

W123
----------
.....

300DT 85 RATIO 1:2.88

300DT TO 84 RATIO 1:3.07

W126
----------...

Just to clarify. The numbers 85 and 84 in the list above represent years 1985 and 1984 correct?

DslBnz · #6 01-26-2004, 08:04 PM

Quote:

Originally posted by coachgeo
Just to clarify. The numbers 85 and 84 in the list above represent years 1985 and 1984 correct?

Yes..,

coachgeo · #7 01-26-2004, 08:21 PM

When considering a rear end swap one has to also consider the tranny ratios. Did MB change ratios of the automatics between cars in the same class (W123 for example) Did they change them much between models with same engine (W123 vs W126)

Sorry I know I should know some of this. Im still trying to stuff all this into my head. If someone has a list of trannies I will try to find time to make a spread sheet file with rear end and tranny's listed together if folk think it would help.

sixto · #8 01-26-2004, 10:06 PM

So it was a 380SE diff. That makes sense. I had a 300SE and it felt like the engine would hit redline before 100mph. The dragstrip crowd will pay plenty for a 300SE diff

Sixto
95 S420
87 300SDL

Breckman99 · #9 01-26-2004, 10:14 PM

Well it seems it was a 380 SE then. The swap was very simple. Pulled the old one out, switched the input yoke with the smaller SD one, bolted everything back in and dropped in the 160 MPH speedo. Nothing more to it.

Breckman99 · #10 01-26-2004, 10:18 PM

Oh and just so you know my old rear end was that of the 80 300SD, according to the chart 3.07. No wonder she feels a bit different....

#11 01-27-2004, 01:35 AM

How have your 0-60 times changed?

Breckman99 · #12 01-27-2004, 03:07 AM

I have not yet checked 0-60 but I will post results soon.

wheelguru · #13 01-27-2004, 04:24 PM

Where did you find the rear end ratios? I have an '84 230e clunker that I would use as a rear end donor for my 300d if I thought it would make a difference, but I don't see the 230 listed. I think the car originally came from Canada, not the US. How can I find out the rear end ratio?
-andy

fredjj · #14 01-27-2004, 04:38 PM

I found a whole bunch of rear axle ratios in the 123 and 126 model CD's. I'd scan and post but it would probably take four separate posts.

DslBnz · #15 01-27-2004, 04:57 PM

Quote:

Originally posted by wheelguru
Where did you find the rear end ratios? I have an '84 230e clunker that I would use as a rear end donor for my 300d if I thought it would make a difference, but I don't see the 230 listed. I think the car originally came from Canada, not the US. How can I find out the rear end ratio?
-andy

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