One of my biggest qualms with the suspension industry is that they don't mark the springs with a simple F(front) and R(rear). I'll bet you 95 percent of mechanics don't have a clue as to which is which, especially when dealing with an MB. Mike very well may be right. They either did not seat the springs correctly or in fact put the fronts in the rear. My ass was riding high after install (about factory level) but only for the two blocks it took me to get home. Go back all angry and stuff and maybe they'll switch them for free.