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  #1  
Old 11-10-2021, 05:09 PM
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Interchange W114 differential gear ratio

I've got a 3.92 ratio on my '74 280C and want to change to a 3.07 . I've got many compatible models to choose from ,W123, W126 first gen. and have come across a 1987 300E W124 with a 3.07 (1.1 ltr box same as mine) will this work ?
Can I swap this '87 W124 differential from a 300E to replace my high geared W114 box ?

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  #2  
Old 11-10-2021, 05:28 PM
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Location: Modesto CA
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Direct interchange:
W114/115
W123
W126 GenI - 5 & 6 cyl., not V8
R/C 107 - 6 cyl.

The diffs in the W124 have a different case mounting; the internals could be used.
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  #3  
Old 11-19-2021, 01:01 AM
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I think you want to make sure the axle lengths are going to be ok when switching from a small 6-cylinder diff to a big 8-cylinder (3.07) diff. I think that the 3.46 came in big and small, and might be the number you really want. With a 3.07, I doubt your car would get out of its own way.

Donít forget to figure out what you are going to do with your Speedo too.
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Past mb: '73 450sl, '81 280slc stick, '71 250, '72 250c, '70 250c, '79 280sl, '73 450sl, parted: '75 240d stick, '69 280s, '73 450slc, '72 450sl,
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  #4  
Old 09-23-2022, 12:59 PM
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I have a W114, E230, 6 cylinders, 1972. I got it a few years back and I believe its original differential had been changed when I got it. I like to know about the ratio of its factory original diff and also which other differential with what ratio would most fit my car.
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  #5  
Old 09-23-2022, 01:19 PM
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Bu:

Look on the lower left corner face of the main case (not the cover) of the diff. The ratio is stamped into that face.
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  #6  
Old 09-24-2022, 12:50 AM
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My friend, as I mentioned the original diff has been changed and that is why I like to learn about the ratio of the differential that the factory installed on the car.
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  #7  
Old 09-24-2022, 11:27 AM
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Hi, Would someone be able to check the following part numbers (115 350 1220, 115 350 3320, and 123 350 6220 with its ratio as 1:4.08) which I have been told are for the right differential for my W114, e230, 6 cylinders, Twin carburetor, Manual transmission, 1972? As for the Manual transmission the following part number has been given to me: 115 260 4201.

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