For that trans to up-shift the GOVERNOR must create pressure, then the valve body will the trans to shift to a higher gear.
Did someone with MB trans experience to drive it OR check the governor pressure?
MANY times the rear pump will seize & shear off the drive pin from the governor.
Time to repair that problem takes on 2-3 hrs & only $10-20 in parts.
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)