I have a 2014 Mercedes Benz 722.9 C350 Sport RWD

The transmission was slipping on shifts and shuddering it was running perfect then the next day is was not. The transmission cooler portion of my radiator is faulty allowing coolant and transmission fluid to mix causing catastrophic failure of the transmission. A local transmission shop told me they wanted 13,000$ to fix to.

So in one week I am going to fix it myself.

I am new to Mercedes Benz so advice is appreciate, this will not be the 1st time I have removed and reinstalled a transmission i done maybe a dozen transmissions with friends of the decades just never on a car like this
I have bought a transmission with 27,000 miles on it for 2,700$ shipped to my door I ordered a new radiator, thermostat, transmission service kit,1/4 torque wrench, and fluid pump to fill he transmission and a lot of other stuff from FCP euro. I have about another 1,300$ in the parts and tools.
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I am concerned about a few things like the programming of the conductor plate and valve body ..my plan was to swap the conductor plate from the original car and the solenoids the donor transmission which came out of a 2013 c350 RWD car
Do I need to swap the valve body too? I'm hoping to get around the conductor plate reprograming procedure.

I am going to be putting the car on jack stands and do this on my back is there and special tools I might or any tricks.. Other than normal removal of a transmission on your back stuff


Do anyone know where to find a book on this topic

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I would perhaps think twice about swapping the valve body from the old transmission. The mixture of coolant and transmission fluid that caused the catastrophic failure of the old transmission also flowed through those valves. I haven't removed the transmission on a W204 but if you want to send your VIN I can look up the instructions in the WIS.

Keep these folks in mind. They can repair your conductor plate, and if it is unrepairable, they can provide a replacement and xfer the programming to the new plate. I have used them in the past with great success. They may be able to source valves, as well. There is an instructional video on their site. FCP has a video, as well.

Mercedes 722.9 Conductor Plate TCM Repair Solution (circuitboardmedics.com)

Also, the issue of faulty radiator/transmission cooler was supposed to be addressed around 2004. Have you searched the forums for this problem? I'll assume you are not the original owner of this car. Does it appear that the radiator was replaced perhaps due to a front-end collision?

Hello alynchI started pulling it out last night.
I Agree with the valve body being full of mix fluids and I was going to open it up and clean it out. I was only going to split it in half and not pull the valves out but after draining the fluid out and see how bad (white looking) I'm thinking I should completely disassemble it and clean it, I just don't know the torque specs for tighten the plates that hold the valves in. Do you know how tight to get them?

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My vin number is WDDGF5HBOEA903790

I'm under the impression that my valve body is calibrated to my conductor plate, this is the reason I am swapping the VB and the conductor plate instead of just the conductor plate

I only have a few bell housing bolts left and it's out of the car so far it's been one of the easiest transmission I've pulled out
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I am not the original owner I've owned the car for about 2 1/2 years but I'm 100% sure the fluids have mix, I started pulling it out yesterday and the fluid is a White color

Here are a couple of documents from the WIS specific to your VIN. I hope these help