IF the 1-2, 2-3 shifts are good then the problem ISN'T the modulator. Modulator problems will affect ALL shifts the same.

Most common failure on that 722.4 trans is the K2 clutch pack & the teflon seals that that drum rides on! WITH that many miles look for a good used trans.

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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)
Retired Moderator