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Interchangable rear Differentials for the 190; 1,8 manual gets diff from C180 auto
Topic Started: Tue Apr 14, 2009 8:33 am (14,641 Views)
alogaparaloga
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Good morning all and I hope you had a nice Easter break.

I would like to know if it is possible to fit a rear diff from a W202 mercedes into a W201.
I found a similar question in the forum, but not an answer.
My 190E is a 1.8 l with 3.64:1 ratio. and I found some w202 autos on ebay that may fit.
Does anybody know were to check the w202 ratios online?
Is anybody using a dealers software for looking on parts, and check parts compatibility?

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Marv
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Evo II Wheel
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I dont think it it would go the prop would be different and i think a 202 is a different size diff and to make things worse then the drive shafts would have to match up to the wheels on a w201.

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Mike wantza Merc
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B)

Help? :-/

I don't read German, but according to the linked site often quoted here, the diff ratio for my 2.0 auto is 3.27 (3,27) which is the same as the 190D and 190e 2.3.
Presumably that means that if I source one from any of those 3 variants, I can fit to my own 190e?
Secondly, if I source a Diff with a slightly higher/lower ratio, such as a 3.46 (3,46) from a 1.8 or a 3.07 (3,07) from a 190e 2.6/190D 2.5, this will knock the accuracy of the speedo out?
Lastly, is there any truth in the whispers that you can buy a servicing kit for a Diff, if so does anyone know what constitutes a 'service' ?

Any help here would be appreciated, as it is my intention to start looking around, while there is no urgency yet, to source a 'spare' diff.
Thanks, in anticipation. Mike

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JM Motorsport
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More than part of things
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Internals are most certainly interchangeable,
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shrekky
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you can have it refurbished.......................new crown and pinion wheels,new bearings and seals............normally cost a couple of hundred quid though


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alogaparaloga
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Hi all again,

I have an update for W202 rear diffs.

I bought a w202 diff from e-bay.

The details are:
It comes from a C180 1.8lt automatic with 87K miles, model of 1997.
The ratio is 3.64 as it is on W201, 1.8 manuals.
And the serial number on tha back plate starts with R201, which is the model designation.

I additionaly measured some dimensions so if someone has a w201 diff available please confirm the following:
rear mounts to input shaft coupler front end = 300 mm

centre shaft diameter = 16 mm
Output shaft flanges N/S to O/S = 230 mm

Now the good news are that The backlash is negligible,
the cost was £80.00 including delivery
And so far it appears to be a straight swap, but not sure for that yet.

Hope someone can confirm some of the above details.
Regards,
Menelaos
Edited by alogaparaloga, Wed May 27, 2009 10:45 pm.
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alogaparaloga
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Today I had a look on the 202 diff to see what different to the 201 diff.
The first thing is that it has no vibration dampers as the 201 open diffs
second is that the mounting points on the backplate are different.
the 201 has 4 mounting holes while the 202 has 2 holes only of bigger size.
an example image that I found on 2phast.com
Posted Image


The following are from the w202
Posted Image

Posted Image

the diff housing serial number is 1081536 3.64
Now the plan is to get under the car and measure the lenght of diff, bolt patern of driveshafts and bolt patern of the back plate,
If the back plates are interchangeable and the total length of the diff is OK then it should go straight.

If this is the end of similarities then I ll have to source another 201 diff and sell the 202.

Edited by alogaparaloga, Sun Feb 6, 2011 1:34 am.
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190 2.6
savvas
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hi, does anybody can help me where to find differential ration 3,07 for me mercedes 190e 2.6 year 1989. do you know any site ?
thanks
savvas
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chrismatheou
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190 2.6
Thu Aug 26, 2010 2:50 pm
hi, does anybody can help me where to find differential ration 3,07 for me mercedes 190e 2.6 year 1989. do you know any site ?
thanks
savvas
Geia sou Savva! B)

This site is a start! Start a new thread in the wanted section another member may have one for sale.
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NZ_190
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Hi, just wondering before I go and make a fool of myself will the diff from a 260e w124 be the same as a 2.6??
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NZ_190
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I have been doing some more research and have found that provided I find a open 3.07.1 dif like I have all that will need changing is the back plate which has 2 mounting screws on the 124 and 4 on the 190s. These are aparently interchangable?? can anyone confirm this?
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alogaparaloga
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I just want to report back regarding this differential interchangability.

For the differential that I described in the posts above, which came from an auto C180 I had to swap the Cover plate and the input flange at the front.
No modifications were required for anything else. so for £80 quid of e-bay well worth the money.
As far as the flange to flange difference between the two (new used/and old diff) there is no need to machine anything as the half shafts can easily take a 2.5mm difference.

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merc190uk
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The Godfather

so the answer is yes they will change with little effort :)

thanks for sharing your research B)
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tjts1
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alogaparaloga
Sun Feb 6, 2011 1:29 am
I just want to report back regarding this differential interchangability.

For the differential that I described in the posts above, which came from an auto C180 I had to swap the Cover plate and the input flange at the front.
No modifications were required for anything else. so for £80 quid of e-bay well worth the money.
As far as the flange to flange difference between the two (new used/and old diff) there is no need to machine anything as the half shafts can easily take a 2.5mm difference.

This is great information. Thank you.
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Salar
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Does a w124 work in this case, I mean, for the time being, I am thinking of a spare one, and I have already come across 3 pieces; 2 of them on a 300 4matic and the other one is very clean (mint) on a 200e.
Edited by Salar, Sun Feb 6, 2011 8:24 pm.
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Salar
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By the way the diff I have now on my 2.3 has the same numbers except for the first three ones after the R, which are 124 rather than 201; I guess this means that a w124 diff would fit on mine in case. Or what do you think guys? Opinions are welcomed
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alogaparaloga
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Check this mate diff discussion thread

You have to consider two things Output Flange to flange dimension and short or long nose (small case as found on 8valve 190s or bigger one as found on 16V) for the packaging but the other basic feature is the ratio. You have to maintain the ratio to keep the speedo reading correct.
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Salar
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alogaparaloga
Wed Feb 9, 2011 6:52 pm
Check this mate diff discussion thread

You have to consider two things Output Flange to flange dimension and short or long nose (small case as found on 8valve 190s or bigger one as found on 16V) for the packaging but the other basic feature is the ratio. You have to maintain the ratio to keep the speedo reading correct.
Thanks mate for the advice, but how can the ration be known, as the only numbers I could find on the back case of the diff are the following: R 124 35 106 08. Also, I think ratios would differ from a manual 190 to an automatic one. So, any clue :help:
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alogaparaloga
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Back of the diff, position five o'clock there is a stamped number on the diff case. just next to the cover plate. you may have to rub off all that sticky dirt to see the number.
Of course ratios will differ from autos to manuals but the idea is that if you find a compatible diff from a much newer model like a C230 or C180 in my case.
I say that because you get a chance of getting something good for a very good price. ie my car is manual and 18 years old but the replacement diff comes from an auto that has less miles than my car, it is less 4 years of life but most importantly an Auto diff has much smoother life than a manual. So it's less likely to be knackered.

I am afraid you have to do your own research on that or bite the bullet and get your diff repaired.
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Salar
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alogaparaloga
Thu Feb 10, 2011 12:11 am
Back of the diff, position five o'clock there is a stamped number on the diff case. just next to the cover plate. you may have to rub off all that sticky dirt to see the number.
Of course ratios will differ from autos to manuals but the idea is that if you find a compatible diff from a much newer model like a C230 or C180 in my case.
I say that because you get a chance of getting something good for a very good price. ie my car is manual and 18 years old but the replacement diff comes from an auto that has less miles than my car, it is less 4 years of life but most importantly an Auto diff has much smoother life than a manual. So it's less likely to be knackered.

I am afraid you have to do your own research on that or bite the bullet and get your diff repaired.
Thank you indeed for the information. In fact, my diff is not that seriously damaged, it is all about a little bit of play (tic-tac) no more nor less; however, I am thinking in a spare one for the future. Also, I could not find any plate on the case :o Hence, I will try to dig on searching again to find that ratio and make a comparison with the ones I have already found, and think never of biting the bullet.
My regards :)
Edited by Salar, Thu Feb 10, 2011 8:46 am.
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