I just serviced the 722.6 transmission on my E300 Diesel. I did this because it seemed to be shifting in a rough manner.

I checked to ensure that the exact, right amount of ATF was in there. It's perfect. Checked it with a proper dipstick that I bought online.

When I take it out, if shifts just fine, and quite smoothly.

The problem happens when I step on it. I kicks down one gear but then just revs and won't shift back to higher gear.

Please help.

I changed some of the fluid, about 4 quarts, with ATF +4
New gasket, cleaned pan, new filter.

Any suggestions?

Gosh, thank you for your smart *** remark.

Mike93108,

Since your car is a 1997 model, it still has the torque converter drain plug. In order to properly service the transmission in your car, you need to drain the transmission pan, change the filter and also drain the torque converter.

The problems you are experiencing may be due to the use of the wrong transmission fluid. ATF +4 does not meet Mercedes-Benz specifications. The current specification for the fluid to be used in the 722.6xx is 236.14

You should get that improper fluid out of there, and replace it with the correct MB approved fluid. We offer Automatic Transmission Service Kits for your car on our site. You can get to them by clicking HERE, or by clicking on the photo of the Automatic Transmission Service Kit below.



Another common issue with the 722.6xx is failure of the Pilot Bushing, or Wiring Harness Spacer. This component will begin to leak fluid, and once it does, the transmission fluid can wick its way up the wiring harness into the transmission control module. While transmission fluid itself is non-conductive, used transmission fluid can be conductive due to a build-up of tiny metallic particles cause by normal wear. This can short out the transmission control module, leading to costly repairs. If your Pilot Bushing is leaking, replace it during a transmission service. You can get to the Pilot Bushings on our site by clicking HERE, or by clicking on the photo of the Pilot Bushing below.



If there is anything else I can help you out with, please feel free to post or send a PM!