I am considering rebuilding my automatic transmission from my 87 420sel. The PN# is 722.324. I have managed to get a service manual from the ATSG group and also have the information from www.transonline.com in my arsenal of weaponry. I am confident that I can get the thing apart, replace the friction parts and seals and back together with no problems. My experience has been that MB cars are built to be serviced and im sure its true of the transmissions as well.

My question relates to the various upgrades that need to be applied to bring the transmission up to date with all the latest fixes and improvements. I have talked to several transmission shops and they all elude to doing some upgrades during the rebuild. Where can I get information on these upgrades? Does the www.transonline.com information contain them? Are the upgrades only done in the valve body? I have not found any information related to adjusting the transmission after the rebuild is complete other than the modulator pressure. Are there any other adjustments internal or external other than the modulator pressure and the bowden cable?

Mercedes does not publish any information about their transmissions to the public. They seem to want to keep their transmissions a secret. All the more reason to do it myself. I am doing this just as a personal challenge and to enjoy the satisfaction of success should I accomplish the mission. Am I crazy and in for the hassle of a lifetime or is this a doable deal? If you guys have any opinions, warnings or otherwise, I would love to hear them.

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I got too many cars!! Insurance eats me alive. Dave

78 Corvette Stingray - 3k
82 242 Turbo Volvo - Manual - 270k
86 300e 5 speed manual - 210k
87 420sel - 240k
89 560sl - 78k
91 420sel - 205k
91 560sel - 85k
94 GMC Suburban - 90k
97 Harley Davidson Heritage Softail - 25k
00 GMC Silverado 1 ton 30k