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If you try to open up those clutch drums without this tool you WILL be frustrated!  You may get them open, but trying to put them back together is something else! If you need instructions or other parts see related products below.

This is Kent's master kit for solving a number of transmission-related shifting problems. Please note it will not solve them all - particularly if your transmission is worn out.

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.

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.

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.

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.

9/2025 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.

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.  Also they made some modifications to beef up the 722.3 transmission for the Big V8 in the W140 chassis.

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 722.4 transmission that was produced from 1984 to 1990 for all 6 and 8-cylinder passenger cars that had a displacement of 2.6 liters or more (EXCEPT the 300D and 300TGD.

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. 

Introductory special. Full video instructions for both repairing pipe leaks and reducing chaffing are included. This is now becoming a bigger problem as these diesels age. Inspect your cooler lines soon!

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.

FITS THE FOLLOWING models listed below: Includes illustrated PDf instructions on replacement. Includes both a new filter and pan gasket to do complete service on your transmission. Consider replacing your old pan to prevent leaks.

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.