You need to find an alignment shop that knows something about MB's & alignment. MOVING any of the alignment adjustments causes all of the other adjustments to change. SO all the adjustments must be readjusted through-out the alignment process.
Replacement of ball joints NORMALLY require removal of the lower control arm & that means that the car WOULD need realignment.
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)