Originally Posted by zip439

My SRT6 has just over 10,000 miles and developed this leak at the electrical connector. Using Mercedes part number 2035400253 (which is a new updated number) I could not get the new pilot bushing to insert into the socket. The white ring which rotates was in the wrong position to allow insertion when the rear notches were aligned with the fingers in the socket on the transmission. I removed the O rings from the new pilot bushing I purchased from FCP Euro, installed them on the original pilot bushing and inserted that into the socket on the transmission. So far so good, but haven't put any miles on it, just test ran it after topping off the fluid in my shop. Following is an email I sent to FCP Euro:

Concerning Mercedes Transmission connector part number 203540023. This is a pilot bushing for electric connector on the 722.6 transmission on my 2005 SRT6 Chrysler Crossfire = 2004 SLK 32 AMG. The part you sent me in the mail would not insert into the transmission socket. On the back of the pilot bushing there are three cuts which must line up with fingers in the socket; This alignment allows the pilot bushing to fully seat in the socket. When I aligned the bushing to the socket the white ring on the pilot bushing was in the five o'clock position. On the original connector which was leaking that white ring was at the eight o'clock position after it was rotated to release the pilot bushing from the socket (In the locked position it is at one o'clock). I could not get the part you sent me to fully insert into the socket because the white ring at the five o'clock position prevented insertion. I removed the O-rings from the new part you sent me, placed them on the original pilot bushing and inserted that into the transmission socket. That seems to work. Time will tell. The part number 203540023 has replaced 9 previous Mercedes part numbers for a multitude of years/models. It appears something has been lost in the process of adaptation. Hope that makes sense.

Their response was can't be sure of my problem without a Mercedes VIN number to cross check their data.

I realize most people have long ago corrected this problem on their cars, but should it reoccur as the poster above, I hope this info will be helpful.

Additional up date: It has been a year and a half since I made this repair and a few thousand miles and the old connector with the new o-rings remains leak free. It seems to be working fine. The original post can be found here at post 140 click: Transmission leak repair