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#1
06-14-2015, 01:46 AM
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1975 Mercedes 280 Manual Transmission swap
hello all,
i have a 1975 280, w114 chassis, m110 motor. i am interested in switching the car to a manual transmission because of the power increase, as well as the fuel economy and general "fun to drive" factor. i have been warned that a if i use a transmission from a 240 that the power will be too much for the transmission and blow it out. i have found a 1989 190se, with a similar motor size (2.6l) and a 5-speed manual transmission. i am wondering if i can use this tranny and if not what is the best transmission to put in this car??? thanks, Jack. 
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#2
06-14-2015, 09:12 AM
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A bit of googling will confirm this, but I am pretty sure that transmissions after the w123 model (-1985) will not easily attach to your engine. And to complicate things, 5 speed w123 trannys are very rare and rather expensive (in the U.S. at least).
__________________
1968 220D, w115, /8, OM615, Automatic transmission. My 1987 300TD wagon was sold and my 2003 W210 E320 wagon was totaled (sheds tear).
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#3
06-14-2015, 09:54 AM
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Quote:
js48: The short answer to your specific question is no. The reasons are: 1) The housing bolt pattern is clocked 17 deg from the vertical, and 2) The starter motor is on the opposite side. If by "best transmission", we accept the idea that a bolt-in project is best, then 4-speeds from 114/115s, and 123s up to about '82 will be suitable. Transmissions after '82 will bolt to the engine, but will require some modification of the shifter/shift rods.
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#4
06-14-2015, 12:55 PM
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Quote:
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#5
06-14-2015, 02:33 PM
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Quote:
If you can find a 115 as a donor car you will get all the parts in one package.
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#6
06-14-2015, 03:41 PM
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thanks for the info. any idea where the best place is to get a parts car? i havent been able to find any 115s on craigslist, although i did find a 77 240d if that could be used?
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#7
06-14-2015, 04:19 PM
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The '77 123 will yield a majority of the required swap parts. The pedal assembly, however, is specific to the 114/115 chassis. If you had a clutch pedal a duplicate could be fabricated, as well as the components of the over-center spring.
A posting in the for sale/wanted section might turn up a pedal assembly.
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#8
06-14-2015, 04:52 PM
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okay sounds good. ill try to get my hands on that car and throw a post up once im in on the project. thanks for all ur help man!
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#9
06-14-2015, 05:26 PM
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js48:
Once you are to the point that your hands are quite dirty, i.e., the old trans is on the ground, and you are thinking about removing the autobox flywheel, stop! There is a matter of flywheel matching/imbalance to be attended to. Clear match marks of flywheel to crank must either be found, or made before removing the flywheel.
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#10
06-14-2015, 05:46 PM
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okay so i found a 79 240d parts car with a 4speed manual tranny in it. the motor is fried so im getting the car for 500$. is this worth it??? i just wanna triple check that everything will fit...
do i need to get any special tools to removed the engine/tranny/pedal assembly??
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#11
06-14-2015, 06:40 PM
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js48:
Unless the front sheet metal around the radiator, and the radiator, have already been cut away, leave the engine in the chassis. The trans/clutch housing can easily be separated from the engine and removed from below. As to value, are there good exterior & interior 123 parts that can be sold? Are you in a high rust area?
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#12
06-14-2015, 07:44 PM
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i live in sacramento, the car is in napa, so rust shouldnt be too much of an issue. the 240 has everything except seats and rear window. all other parts are clean and the interior is almost perfect
when i put the manual into my 280 im going to pull the motor and refresh some parts underneath, since the car has been sitting for 15+ years. another question.. are the wheels/tires interchangeable between the '79 240 and the '75 280?
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