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  #1  
Old 07-04-2015, 08:48 PM
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Join Date: Feb 2011
Location: Manila
Posts: 25
automatic transmission from gas donor car to diesel car

Hi, I currently have a w201 190d manual transmission.

Will an automatic transmission from a w124 m103 engine fit? What are the things I should look out for?

1) different length propeller shaft, have to source this out
2) different brake pedals, have to source this out
3) will need vcv and route the vaccuum lines to the transmission
4) most likely the gas a/t starts in 2nd gear, can be modified to shift in 1st?
5) torque converter of gas engine, not sure if this is ok (crawls differently at idle)
6) no kick down switch, not sure how hard to place one

I can take care of 1-3. Need guidance on 4-6

Should I be concerned of other things listed above?

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  #2  
Old 07-04-2015, 09:28 PM
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Well it is really not to difficult to figure out. All you have to do is follow one of the many threads of or on converting a diesel Benz from an automatic to a four or five speed. You just want to go the other way. But why. Your 190D most probably has a 5 speed and a fine balanced clutch. It is pretty free from problems, much more so at least then the older MB automatics, which really are slush boxes and are quite expensive to overhaul. Your fuel mileage will suffer quite a little in this exchange.
But there are other things one should consider. Do you have the complete transmission setup for this automatic. Pedal box, shifter and linkage, surely you have the proper flywheel for the automatic and you will probably need 12 new studs to attach the flywheel to the crankshaft and they are expensive at about $7.00 each. Then your drive shaft will probably have to be modified a little longer or shorter. Then also, transmission mounts can be greatly different and a real dandy to find used. Then you should consider the rear axle ratio. Will the gearing for the stick shift work well with the automatic. Often they do not. If you change the rear differential, then you should change the speedometer also. In my 10 years or so on the Forum this is the first time I have heard of a change in that direction. Really, what is your reason for wanting to do it?
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  #3  
Old 07-04-2015, 10:11 PM
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Join Date: Feb 2011
Location: Manila
Posts: 25
I live in a country where traffic is at a snail's pace. Hence, the move to a/t transmission

Also, I have a transmission rattling concern where people told me it's normal and live with it.

Rattling problem:
Transmission rattles at idle (once it is warmed up). When I press on the clutch or when the gear is engaged, there is no rattle

I've already replaced the release bearing and pilot bearing. Also changed the gear oil to 140 but rattling noise is still there

Afterwards, I was able to find and replace with 2 other surplus transmissions. Upon trying 2 of them, still same problem
Transmission rattles when engine is warm, no gear is engaged, engine is idling

Rattling disappears when you depress on the clutch Also when you move the gear lever slightly forward or backward to any gear (without pressing on the clutch)

I found a post that closely describes my problem. UUC Motorwerks * What is gear rattle? Transmission noise? Flywheel rattle?

I was also told it's the splines in the clutch that rattles against the gearbox input shaft.


I have a the complete transmission setup (Pedal box, shifter and linkage) as I have a donor car but its from an m103 gas engine

Now, back to my question. Need advise on 4-6 above

Also #7. Gas a/t don't come with bowden cable?
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Old 07-05-2015, 03:09 PM
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Join Date: Sep 2012
Location: Wilmington, NC by the Atlantic ocean
Posts: 2,530
Not trying to rain on your parade but a couple of thoughts:

1) I'd really consider selling this car and getting a nice auto trans car. The manual trans cars have value and the auto cars are more common and therefore cheaper if you can find a nice one (they're out there).

2) If you REALLY want to do this swap I'd consider a conversion plate and one of the GM overdrive automatics. They're tough and plentiful and the adaptors are readily available. If I hadn't found my 4 speed that's what I was going to do with the race truck. There are also driveshaft adaptors to get you to a conventional (well, in the US anyhow) U-joint and slip yoke driveshaft - then any local driveshaft shop can build you a shaft. I used the Jags That Run adaptor plate and I think my shaft was $400, +/-. Works great.

Just some ideas

Dan
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  #5  
Old 07-05-2015, 10:26 PM
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Location: Carson City, NV
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I'm not sure about the used car market in Manila, but in the U.S., the vastly easier solution would be to sell the manual car and buy an automatic one.

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