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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.
If you are experiencing very hard or less than perfect shifts, a failed transmission modulator could be the problem. New Genuine Mercedes part. This unit is an upgrade over the original. It has a better thrust pin design which is less prone to cause pressure variations in cold weather.
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.
PLEASE NOTE: You will get the filter and the gasket for the original transmission pan. Make sure your pan is original! This combo includes the three kits listing below. You will get full video instructions and will help you do this and save big $$$.
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.
In this 15-minute video, Kent will show you step-by-step how to safely remove the Bowden cable without damaging it and how to install it to get the proper connection. This is not as easy as it looks, and you can break it if you are not careful.
This fits a number of lmid 1960s to early 1970s models with automatic transmission. 250SL 280SL 250S 250SE 280S 280SE 280SE 300SEL. Check under the front of your car to make sure this matches what you have before ordering.
Kent is a firm believer in using these strong magnets inside a transmission pan to help extend its useful life.
They should be placed toward the rear of the pan as shown in the picture below.
For ALL 2003 to 2010 7-Speed automatic transmissions( early 722.9 WITHOUT option code A89 indicating reduced friction). These are the 7G transmissions that use the red fluid with the shallower transmission pan. This is a complete kit for your transmission 40K service, not including the fluid.
2FREE limp-home troubleshooting video included! Be forewarned! It is not as easy as it looks on some YouTube videos to remove a valve body and conductor plate from an early 722.9 transmission.
Inspect for adjustment and tension. If you disconnect the cable from the throttle linkage and there is no spring back pressure then the cable is broken.
New o-ring seal installed.
These transmission pans get "out of shape" due to over-torquing the bolts. That crushes the stops (see below), and when that happens, it is very hard to get the pan seal not to leak. Your best option if you are doing a transmission service is to replace the pan.
Also works on 380SL and 560SL transmissions. Before you think you can easily remove the Bowden cable from the transmission, watch the video below.
These transmissions are now 40+ years old, and with age comes hardened o-rings and seals, leading to what I call "pesky" leaks. They are not bad enough to flow on the ground, but they do leave wetness around the transmission and drips on the garage floor.
These transmissions are now 40+ years old, and with age comes hardened o-rings and seals, leading to what I call "pesky" leaks.
This kit will allow you to properly fill any 722.9 7 speed automatic transmission as well as other cars that use the underfill method.
Removing the valve body is not difficult, but it is fraught with risk. It is easy to damage the conductor plate if not removed properly, and that can be a very expensive mistake.
If you are planning to remove your 722.9 conductor plate for inspection or repair, you will want to take the time to thoroughly clean the plate, the valve body, and the solenoids. No cleaning agents or foreign chemicals should be used.
To to prevent potential fluid weeping on the end of this pipe you might want to replace them if you end of removing the pipe in your procedure.
Since there are no dipsticks on these transmissions, the DIY way to check fluid level is from under the car with a touch-free thermometer to measure the heat of the transmission fluid BEFORE setting the correct level. Instructions are included with my full 722.9 transmission fill kit.
This is absolutely the best thing you can do for your older 2003 to mid-2010 Mercedes 7-speed transmission. In this 19-minute video, Kent will show you what is required to purchase and install to make this upgrade on an early 722.9 transmission. Yes, it is something you can do yourself!
You want your 2003 to 2010 7-speed transmission to last - this you should absolutely do.
This easy-to-operate ONE gallon pressure pump tank will help you fill your 722.9 transmission with minimal mess and fuss. It includes over 5 feet of hose ( 30 inches which are clear so you can see the flow rate.
Many enthusiasts are now buying these 2004 to mid-2010 high-performance Mercedes with little thought to the transmission.
If your clutch is making growling noise when you push the pedal in these are the parts you need to fix it. You might want to consider replacing the pressure plate and disc while you have the transmission out.
In this 17 minute instructional video Kent will walk you through removing and installation a VCV valve off the back of the injection pump and the proper way to adjust the linkage travel for best performance. A number of tips will be shared to reduce frustration and prevent problems.
Clear instructions on how to remove the old boot and install a new one. Total run time:
This 12-minute instructional video covers the full procedure of replacing both shift bushings in a 1999 R129 SL500 and goes over the challenges of replacing the same bushings in a 2003 ML320.
The R107 and C107 plastic shift bushings are very common parts that need to be replaced more often than not. 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.
This was a new replacement unit only on the car for about five years before the 1980 transmission was removed. RED MEANS RED. Only works if your current transmission has a red modulator THAT LOOKS EXACTLY LIKE THIS ONE. Will also work on some 80-81 W123 240's.
These are the parts and instructions you will need to fix a very common shifting problem in the 1996 to 2006 Mercedes 722.6 five (5) speed automatic transmission.
This is PART 3 of Kent’s three part video series on troubleshooting and repairing a very common shifting problem in the 1996 to 2006 Mercedes 722.6 five (5) speed automatic transmission.
This is PART 2 of Kent’s three part video series on troubleshooting and repairing a very common shifting problem in the 1996 to 2006 Mercedes 722.6 five (5) speed automatic transmission.