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#1
03-21-2003, 08:43 PM
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Axle whine 74 280. Swap for 123 Axle?
The axle on a 1974 280 I just bought is whiiiiiiiiiiiining.
However, I would like to change for a higher ratio for cruising. Can I use off a 123 series? Or what should I use. Any ideas. BTW, this car is really nice, dark blue, yummy, and the sound of that straight six is lovely. 
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#2
03-22-2003, 03:32 AM
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Have heard that axle shafts are interchangable, so it follows the pumpkin will also swap from 123 to 114/115.
It seems like one of those deals where you've got to have donor and recipient cars side-by-side to know for sure.
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#3
03-25-2003, 08:06 PM
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Thanks for the response.
I shall check out the ratio. The car accelerates through to top gear by about 30 mph and then she is spinning quite well at 60mph. I think they should have added another gear , or ditched the ultra low 1st, that I have never used, and made a real 4 speed. Thanks
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#4
03-29-2003, 11:05 PM
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The 123 Diff will work. Do a search on my postings as I changed my ratio to the lower 3.06 out of a 82 300d Turbo.
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#5
03-26-2004, 12:14 PM
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'74 280 gear ratio
Dear MB friends:
Along related lines, I have what looks to be the same car in question (114.060), brown 4dr, etc. I also have a really badly rusted out '74 280C parts car with a manual trans., Thinking about better milage (lower engine rpms at cruising), I wonder if there would be any benefit to switching the rear end from the 280C... Would the coupe have a higher geared rear axle or would they be the same? Thanks, Will in MN
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#6
03-26-2004, 04:44 PM
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Final drives have got the actual ratio stamped on flat section at rear of the differential..... it will appear lookin something like 3.60 or whatever.
Typical of MB, they must have mixed and matched parts all over the place on the 114, 115, 116 and even with late 70's early version 123. Nobody knows for sure which ratio pumpkins went where. For example, its been reported that American 4.5 ratios were somewhere around 4.xx - wheras i can vouche that 116 Euro car 280SEL 4-spd had final drive ratio of 3.60. Hell, for all I know the lowest axle ratio, say somwhere around 2.83, might even be found on the 5 cyl 115 or turbo-charged 116..... which would make perfect sense to me considering the 5 cyl diesel immense low end torque curve. If anybody out there has a handle on which cars had which final gear ratios - I'd like to hear it. Swapping pumpkins for an 'overdrive' top end sounds like an excellent idea to me. Last edited by 300SDog; 03-26-2004 at 04:53 PM.
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#7
03-26-2004, 06:34 PM
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Will -
Believe the coupe and the sedan had the same 3.69 ratio.
__________________
Chuck Taylor Falls Church VA '66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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#8
03-26-2004, 08:34 PM
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Hello,
You can use a diff out of any W123 up to 1981 and reuse the original half shafts. Best bet would be a W123 300d unit. Hope that helps.
__________________
Nachi11744
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#9
03-26-2004, 09:08 PM
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Hi
I have done a swap from a 280 to my 123 200 euro and they fit with the exception of the rear cover, which you have to swap over but the diff fits perfectly. Also you can check the ratio numbers stamped on the diff flange/cover mating surface. Its on the lower left of the flange part that protrudes out. Probably have to scrape it clean. Mine was a 3.92. Oreo
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