That was the very first question I asked, and they are supportive...I know what Jim is getting at here. This isn't for the novice. You need to have someone experienced, that has done rear end work before, and is familiar with shimming, backlash and all. You don't want to ruin your day and pocket book with a bad install...Freddie, my mechanic is very familiar with most gears, Chevy, Ford, Chysler, but it will be his first MB...so, he and I will have questions as we do this...