It all starts with negotiation, negotiation, first try for mechanic price at mercedes dealer for rebuilt unit. Then work out installation costs with transmission shop (about $400) If mercedes dealer is reasonably close to trans shop, they will deliver and pickup old unit, at no cost. Cost for mecedes unit about $1600 plus 400 equals total approx $2000. I have paid $2500 in past for inferior unit. good luck, AbeG