Can't say much about the actual install, but you should seriously reconsider using Adsitco if you haven't already purchased from them. Many folks on this forum have had problems with them and say that their management tends to be less than agreeable when issues arise. From what I have read here, there are other better, more affordable sources for rebuilt transmissions.

Do a search just to be sure. Just my $.02.

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280