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ONLY ONE AVAILABLE. Very good used working Bowden cable with good plastic threads on the adjuster. No longer available new. This will ONLY fit the 1985 transmissions with the black modulator. EASY twist install. No instructions needed.:
If your modulator is working ok, but leaking transmission fluid, you may only need to replace the inexpensive oring ( o ring ). You do have to be careful when removing the modulator from the transmission. For instructions (available separately) see related products below.
Transmission service on these older Mercedes is very often neglected and it is something you can do yourself. It should be done every 30,000 miles or every 5 years (whichever comes first). After you watch this video you will find out why you should do it yourself!
In this 5 and a half minute video Kent will show you how to replace the o-ring seal at the base of the dip stick / fill tube going into the automatic transmission case on the right side.
This is becoming one of the common transmission fluid leaks on these older automatics. If the trans is leaking fluid in small puddles while the car sits for longer periods suspect this seal. You can be fooled thinking it is coming from the pan gasket.
Custom ordered for a better fit than original! special Oring seal for the bowden cable housing where it connects to the right side of the automatic transmission. This is a common leak area and you may be fooled into thinking it is leaking out of the pan gasket.
Illustrated 6 page step-by-step instructions for proper removal and installation of the modulator upgrade for the years and models noted here. Includes how-to specific details for using the new adjustment cap on the upgraded OEM modulators now available. These are installation instructions only.
The bowden cable runs from the transmission to the throttle linkage on many Mercedes from the early 1980's up through the early mid 1990's. When this cable fails or is out of adjustment the transmission will either shift too early or too late.
The plastic shift bushing is a very common part that needs to be replaced on older Mercedes. Can you believe it is the exact same part that was used on all models for over 25 years! It is an inexpensive part that can cause big problems if it breaks out.
If you have ever tried to remove and reinstall a shift rod attachment clip under your Benz you know how frustrating it can be.
I have received so many emails on this topic that I had to sit down and write a very detailed manual over 130 pages in length! Let's face it! Diesel automatic transmissions can be troublesome, particularly those models that use vacuum to control shifts.
INCLUDES TRANSMISSION PEAK TUNING MANUAL. DO NOT ORDER SEPARATELY
This unique kit will allow you to hook up a 30 in HG vacuum gauge between your vacuum control shifting valve (VCV) and your transmission modulator to test the VCV for proper function and to tune it for peak shifting performance.
Applicable to 114 115 116 123 and 126 Chassis, years and models listed above. Troubleshooting an annoying shift problem must first start with the vacuum modulator.
I don't think there is any owner out there who has owned a 1978 to 1993 diesel automatic for any length of time and who has not had some sort of shift problem with the transmission. Maybe it was just a little jerk or a slipping shift. Maybe the rear end clunked hard when you came to a stop.
If your transmission is shifting too soon it can really rob your car of power and acceleration. If it is shifting too late it can be very loud and annoying and even affect fuel economy.
9/25 Update: Green and Red Modulators are NLA, and we have been informed that they will not be remanufactured. But, do not panic! You may have heard that you must replace your 1981 to 1995 transmission modulator with the correct color top. We have just learned that this is not necessarily true.
PLEASE NOTE: This should be used in conjunction with our modulator pressure test kit (see below). It can be unhealthy for your transmission to just "guess by feel" where the T-pin should be turned.
Out of years of frustration trying to adjust the modulator during a test drive, Kent came up with a better and faster way to make adjustments by just "reaching" under the car. This little device replaces the plastic cap during testing and adjustment.
Kent will show you the procedure (along with troubleshooting and testing tips) with a 722.3 Transmission on the bench.
In this 13-minute session, Kent will open up the planetary gear assembly with the one-way clutch and show you how to put in the new seals. This one is a little bit tricky. You have to be careful not to knock the clutch assembly apart. It also takes some effort to get it all back together.
In this detailed step-by-step 20-minute video instruction, Kent will take this unit apart on the bench and demonstrate how to install all new O-rings and seals. 72234CLASS
In this xx-minute video, Kent will explain how to set up and use the different components in his kit (see below) to test modulation pressure in a 1981 to 1995 automatic transmission. This should be done when replacing the modulator or after rebuilding a transmission.
When installing a new vacuum modulator on your transmission, you most likely will need to adjust it. There are two ways to do this.
This is an improved factory upgrade for the older 722.3 transmission valve body. The accumulator parts you install are Genuine Mercedes. The intent of this upgrade is to improve the transition from 2nd to 3rd shift by adjusting the pressure in the K1 drum.
In Part 7 of this transmission rebuild training class, Kent will prep the drums for reassembly with the new seals. Installation of the piston in the K1 drum can be particularly challenging.
These are probably the most important internal seals that you need to replace. Pressure loss in the K1 and K2 is probably the primary reason for delayed shifts and flares between shifts. This is the first part in resealing these important brake drums.
In Part 2 of this training series, Kent will show you what you will want to inspect before you begin ordering parts for a transmission overhaul. In most cases, you will only need gaskets, seals, and clutches, but you want to make sure. 72234CLASS
In this first class lesson, Kent will take apart a non-shifting transmission that he removed from a 1987 300E. The video is 23 minutes long, and you will get to see how everything comes off and out of the transmission case to leave you in awe of what lies inside.
Three seals in each drum need to be replaced. Only the bottom "hidden" drum seals in Viton are included.
New August, 2025. Introductory sale. This transmission overhaul tool set is custom-modified here in our shop at MercedesSource. We make it to order, and it is time-consuming. Please allow up to 5 weekdays before it can be shipped to you. It contains five tools.
The B1 piston assembly is not easy to remove and then reinstall. Because of the length of the two big springs behind the cover, it takes a tool that has a lengthy throw.
We modified this slide hammer puller set in our shop so it will work in removing two key components in the 722.3 and 722.4 automatic transmissions. Getting the B2 piston and sleeve out of the case can be a real bear without this tool. With it, it comes out quickly and easily.
You will need a 12-point DEEP socket. That is the only thing that will work. Most impact sockets are six-sided. The best way to remove this nut is with a big impact wrench with the transmission locked in park. So you will need a quality heavy-duty socket. This one is made in the U.S.A.
Take a very close look at the picture. These are all the gaskets and seals you will need to replace if you open up your 722.3 transmission that was produced from 1981 to 1995 for all 6 and 8 cylinder passenger cars that had a displacement of 3.0 liters or more.
This will work on the 722.3 transmission BUT NOT the 722.4 smaller transmission found in some 1985 to 1995 models. The piston diameters are different. We are learning, as others are, that these parts are becoming a HIGH preventative maintenance item on these old transmissions.
What a surprise when you find the early W221 and early W212 4matics don't have a fill plug in the front differential! The factory manual instructs removing the right front axle to fill and check the level. What??
In this 6-minute video, Kent will explain the use of each component included in his 722.6 power drain kit.
In this 24-minute video, Kent will
If you want to get as much of the old transmission fluid out of the valve body, torque converter, oil cooler, and lines, then you will need to do more than just drain the pan and the torque converter ( if it even has a drain plug). Watch the video below for more details.
Make sure this is the correct kit for your Mercedes BEFORE ordering. We have an upgrade kit for the earlier transmission that includes a new pan, but when servicing the later 722.9, you do not need to replace the pan.
Often not done, but you will regret not adding this correct SACHS grease to you clutch input shaft splines! Regular grease with not stand up over time.
A high quality bearing. It is a good idea to replace this anytime you have the transmission. Remember it spins a lot!
PLEASE NOTE: This is a "made to order" kit that we assemble after purchase. Please allow 3 to 4 days before it will ship. Save $20 when you purchase these two kits together. Each can also be purchased separately. For a full description of each kit, click on the related products below.
Very common wear item due to aging rubber. Can be easily installed by putting a piece of plywood on the bottom of the transmission pan and use a floor jack to lightly jack up the back of the transmission to replace the mount.
In this 24-minute instructional video, Kent shows you more than just how to change the transmission filter and the pan.
In this detailed 22-minute video instruction, Kent will show you how to use his kit to perform a power drain on most 1965 to 1995 automatic transmission.
Yes, YOU can fully drain all your transmission without using any type of "power flush." Full detailed video instructions are included. This kit is easy to connect and the process is quick and clean. Watch Kent's YouTube video below for full details.