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  #1  
Old 08-06-2016, 05:53 AM
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Shortest ratio W124/W201 185mm differential?

Hello,
Would anyone happen to know if the 3.92 gear and pinion was the shortest ratio made for the 185mm differential case?
If not, what shorter ratios were available, and in which part of the world?

Did any vehicles in the US come with the 3.92 differential, or would it need to be purchased from Europe?
Finally, what is the shortest gear ratio that can be found in the US?

My apologies for all the questions, but thank you for any information.

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Old 08-06-2016, 11:12 AM
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The shortest ratio I recall from the era on USA cars was a 3.46 used on the 300SE. I believe it used the same axle housing at the six-cylinder 124s. You refer to a 185 mm axle, which is probably the ring gear diameter, but I haven't heard the axle described that way before.

The early four-cylinder 201s used a smaller axle housing, but I think all later 201s both four and six used the same basic axle (and transmission) as the six cylinder 124s.

The above refers to USA vehicles. Other markets may be different.

Duke
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Old 08-06-2016, 01:24 PM
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For center sections with a 185mm ring gear the shortest ratio world-wide is 4.36:1, and for USA delivery, the shortest is 3.92:1.
3.92 gears were found in W114/115, and a few W123 applications.
The tallest 185mm is 2.88:1.
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Old 08-06-2016, 10:46 PM
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Quote:
Originally Posted by Frank Reiner View Post
For center sections with a 185mm ring gear the shortest ratio world-wide is 4.36:1, and for USA delivery, the shortest is 3.92:1.
3.92 gears were found in W114/115, and a few W123 applications.
Unfortunately despite both being 185mm in diameter, the ring gears and pinions are not a direct fit into the W124 differential, at least as far as I know.


Quote:
Originally Posted by Duke2.6 View Post
The shortest ratio I recall from the era on USA cars was a 3.46 used on the 300SE.
I was hoping that at least the 3.64 was available in the US, but it does not seem that way after searching through EPC's.
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Old 08-07-2016, 12:36 AM
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3.46 is the final drive for my W201 which was originally a 4 speed 1.8 but the 3.64 was the final drive for the 5 speed (both 2.0 and 1.8 litre engines)

The 3.92 sounds like a 2.0 diesel final drive.

There was a whole load of information on the Mercedes classic wiki site but the links don't work any more - I can't find the data at the moment it has been moved / removed
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Old 08-07-2016, 11:53 AM
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Re: W201 diffs
Other than the 4-valve, 4 cylinder cars, and the 6 cylinder cars, all the rest have diffs with a ring gear diameter of 168mm.
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Old 08-13-2016, 09:08 AM
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Arrow

The w201 had 168 mm or 185 mm diff.
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Old 08-16-2016, 05:49 AM
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Upon searching Ebay sites from around the world along with several EPC's, it seems the 3.92 was the shortest ratio available that fits into the 185mm W124-style differential housing.
It was found in several models in Europe between the late 80s and early 2000s, usually paired with smaller 2.0-2.6L engines and manual transmissions.
The differential housings have some differences, but the 3.92 ring gear and pinion part number is the same for the W201, W202, W124, W210, W209, R129, and possibly other chassis I am forgetting.
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Old 09-04-2016, 02:29 AM
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The 3.92 differential arrived from Germany.

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Old 09-04-2016, 09:05 AM
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WOW that's dedication.

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