3.69 Rear End in my Euro 280E? - Mercedes-Benz Forum
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 23 (permalink) Old 05-17-2019, 11:26 AM Thread Starter
BenzWorld Member
 
BORG47's Avatar
 
Date registered: Oct 2018
Vehicle: 1981 280E "Rusty"
Location: Orbiting over Bellingham, WA.
Posts: 95
Mentioned: 0 Post(s)
Quoted: 8 Post(s)
(Thread Starter)
3.69 Rear End in my Euro 280E?

Greetings again,

After watching one of those Mercedes-Source episodes where he swaps out the rear end in a 240D, I became curious about what differential gear ratio I had in Rusty. When I had scraped away the road grime from the edge of the housing with the numbers on it, I finally had part of my answer. My reason for the question is that I am not sure the 3.69 is original to the car, and I want to know about the driving characteristics of that ratio with my M110 straight-six and automatic transmission. There were also a few other numbers listed before the listed ratio, "044281", that I cannot decipher. Can anyone tell me about this setup, and does anyone have any opinions of it?

I don't have any pictures, mostly because it was difficult enough squeezing under the car and avoiding banging my head on the exhaust silencer (which didn't quite silence me!).
BORG47 is online now  
Sponsored Links
Advertisement
 
post #2 of 23 (permalink) Old 05-17-2019, 11:38 AM
BenzWorld Member
 
Date registered: Jul 2018
Vehicle: 1990 300SE
Location: North East PA
Posts: 129
Mentioned: 0 Post(s)
Quoted: 33 Post(s)
your car should have a 3.58 ratio diff so maybe someone swapped one from a 240D or carbureted 230
christuna is offline  
post #3 of 23 (permalink) Old 05-20-2019, 05:24 AM
BenzWorld Senior Member
 
Date registered: Aug 2011
Vehicle: Diesels om616 -> om606
Location: Sweden-gothenburg
Posts: 469
Mentioned: 0 Post(s)
Quoted: 85 Post(s)
Garage
And its a w123 and not w114?

Ive worked on two 280 engines, one being a w114 had the 3.69 diff, the 380CE c123 had a 3.58.

Its not that big of a difference between the two to be honest, the w114 diff was swapped for a 3.07 to get better MPG, aswell as a more comfortable ride.
It didnt feel slower, rather like it had more torque, it pushed better, and had better use of the gears.
For normal driving id do that swap again anytime.

(the 123 have a om602 turbo engine and a fivespeed and was mated to a 2.88 diff, so that would be irrelevant for you )

3.69 to a 3.58 swap wouldnt be worth the hazzle if you ask me, unless your current diff is leaking/making noises.

Daily: w123 om602 7.5mm 200whp
special/projects/storage: 20 cars +

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
swampmonkey is offline  
Sponsored Links
Advertisement
 
post #4 of 23 (permalink) Old 05-20-2019, 09:25 AM Thread Starter
BenzWorld Member
 
BORG47's Avatar
 
Date registered: Oct 2018
Vehicle: 1981 280E "Rusty"
Location: Orbiting over Bellingham, WA.
Posts: 95
Mentioned: 0 Post(s)
Quoted: 8 Post(s)
(Thread Starter)
Quote:
Originally Posted by swampmonkey View Post
And its a w123 and not w114?

Ive worked on two 280 engines, one being a w114 had the 3.69 diff, the 380CE c123 had a 3.58.

Its not that big of a difference between the two to be honest, the w114 diff was swapped for a 3.07 to get better MPG, aswell as a more comfortable ride.
It didnt feel slower, rather like it had more torque, it pushed better, and had better use of the gears.
For normal driving id do that swap again anytime.

(the 123 have a om602 turbo engine and a fivespeed and was mated to a 2.88 diff, so that would be irrelevant for you )

3.69 to a 3.58 swap wouldnt be worth the hazzle if you ask me, unless your current diff is leaking/making noises.
I'm pretty sure it is a W123!

I would assume a higher gear ratio would be a little less efficient with that motor (engine), but I would also assume it would be able to supply enough torque to the diff (-erential) to make it competent in the traffic we have around here (like Seattle, just without anything cool). The next factor is that I haven't yet driven the car personally, so my opinion is based off of speculation and other people's firsthand experience. How about we pause this thread, I come back in 3 years after I have finished the restoration, and then I ask for insight? If it turns out I like this setup, I will leave it as it is. If it turns out to be less of a perfect ride, keep in mind I am barely at the age I can legally drive this thing!

Judging by how many components are leaky, I am surprised the diff is not losing any fluid. We'll see if it stays that way!
BORG47 is online now  
post #5 of 23 (permalink) Old 05-20-2019, 10:51 AM
BenzWorld Member
 
kevdupuis's Avatar
 
Date registered: May 2016
Vehicle: 1985 300 TD 1981 300 SD
Location: Belleville On. Ca.
Posts: 273
Mentioned: 1 Post(s)
Quoted: 37 Post(s)
Man i wish I had a set of low 3.0? gears for my 85, watching the tach hitting 3000 rpm while cruising at 112 kmh (70 mph) always makes me cringe.
kevdupuis is offline  
post #6 of 23 (permalink) Old 05-20-2019, 02:30 PM
BenzWorld Member
 
Date registered: Jul 2018
Vehicle: 1990 300SE
Location: North East PA
Posts: 129
Mentioned: 0 Post(s)
Quoted: 33 Post(s)
Quote:
Originally Posted by kevdupuis View Post
Man i wish I had a set of low 3.0? gears for my 85, watching the tach hitting 3000 rpm while cruising at 112 kmh (70 mph) always makes me cringe.
i'm preety sure that 3k rpm at 70 is correct with 3.07 gears (remember unlike a lot of other automatics 4th gear in mercedes is 1:1)

and also 1985 was the only year where w123 and w126 turbos got the 2.88 gears so you should have slightly lower rpm unless someone swapped the diff
christuna is offline  
post #7 of 23 (permalink) Old 05-22-2019, 06:02 AM
BenzWorld Senior Member
 
Date registered: Aug 2011
Vehicle: Diesels om616 -> om606
Location: Sweden-gothenburg
Posts: 469
Mentioned: 0 Post(s)
Quoted: 85 Post(s)
Garage
Quote:
Originally Posted by christuna View Post
i'm preety sure that 3k rpm at 70 is correct with 3.07 gears (remember unlike a lot of other automatics 4th gear in mercedes is 1:1)

and also 1985 was the only year where w123 and w126 turbos got the 2.88 gears so you should have slightly lower rpm unless someone swapped the diff
i might be misstaken, but as far as ive understood, the 2.88 was somewhat limited to california or alike.
Us europeans never got it atleast, and i think the same goes for a bunch of US-states aswell.

Daily: w123 om602 7.5mm 200whp
special/projects/storage: 20 cars +

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
swampmonkey is offline  
post #8 of 23 (permalink) Old 05-22-2019, 09:54 AM
Premium Member
 
Dr.Grillz's Avatar
 
Date registered: Aug 2002
Vehicle: Mercedes
Location: NA
Posts: 9,038
Mentioned: 2 Post(s)
Quoted: 277 Post(s)
Lifetime Premium Member
When the time comes and if you're interested, I'll have a correct 280E speedometer unit available in MPH (140mph). This will work with the correct 280E differential with the 3.58 ratio.

1980 Mercedes 280TE AMG
1990 Mercedes 560SEL with AMG parts modifications
1991 Mercedes 190E AMG with Brabus 4-cyl M102 2.6
Dr.Grillz is offline  
post #9 of 23 (permalink) Old 05-22-2019, 12:16 PM
BenzWorld Member
 
Date registered: Jul 2018
Vehicle: 1990 300SE
Location: North East PA
Posts: 129
Mentioned: 0 Post(s)
Quoted: 33 Post(s)
Quote:
Originally Posted by swampmonkey View Post
i might be misstaken, but as far as ive understood, the 2.88 was somewhat limited to california or alike.
Us europeans never got it atleast, and i think the same goes for a bunch of US-states aswell.
from what I've been reading 2.88 in 1985 was installed on all federal cars but I don't have a source to confirm.

2.88 was also installed on all 1986-1987 300SDL (won't fit a w123 because its a different case)

And yes all euros got 3.07 (only w123 wagon available with turbo no w126 turbo)

1985 california got the 722.4 transmission with different air filter, trap oxidizer and other stuff while other states got the regular 722.3

off topic: I'm visiting gothenburg in 2 weeks
christuna is offline  
post #10 of 23 (permalink) Old 05-22-2019, 04:35 PM
BenzWorld Senior Member
 
Date registered: Aug 2011
Vehicle: Diesels om616 -> om606
Location: Sweden-gothenburg
Posts: 469
Mentioned: 0 Post(s)
Quoted: 85 Post(s)
Garage
Quote:
Originally Posted by christuna View Post
from what I've been reading 2.88 in 1985 was installed on all federal cars but I don't have a source to confirm.

2.88 was also installed on all 1986-1987 300SDL (won't fit a w123 because its a different case)

And yes all euros got 3.07 (only w123 wagon available with turbo no w126 turbo)

1985 california got the 722.4 transmission with different air filter, trap oxidizer and other stuff while other states got the regular 722.3

off topic: I'm visiting gothenburg in 2 weeks
Might be that way, ive heard of us 1985s that didnt have the 2.88 either. so i dont know.

Welcome to gothenburg!
if i have time il gladly show you around
What are you doing here then?
Il drop you a message

Daily: w123 om602 7.5mm 200whp
special/projects/storage: 20 cars +

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
swampmonkey is offline  
Sponsored Links
Advertisement
 
Reply

  Mercedes-Benz Forum > Mercedes-Benz Sedan Forums > W123 E,CE,D,CD,TD,TE Class

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Mercedes-Benz Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Topic Author Forum Replies Last Post
Decoding ML datacards (what all those option codes mean!) stingray.au W163 M-Class 10 09-01-2016 10:30 AM
The Ticking Euro Bomb How a Good Idea Became a Tragedy Teutone Off-Topic 8 10-06-2011 09:33 AM
R107 SL/SLC bits on eBay, including euro bumpers, lights, etc. GGR For Sale/Wanted/Trade/Giveaway 0 04-16-2009 05:05 AM
PHOTO OF YOUR CAR WITH VIN DECODER 93 BENZ S400SEL General Mercedes-Benz 36 02-12-2006 11:18 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 

Title goes here

close
video goes here
description goes here. Read Full Story
For the best viewing experience please update your browser to Google Chrome