Modulator pressure is fixed. The test spec is 6.8bar at stall speed full throttle vehicle stationary.
Working pressure is 13.6bar under above conditions in "L" pos. 8.9bar in position "D", and 18 and above in reverse.
Stall speed should be 1600-1700rpm.
Kickdown shifts 1-2-1 Pos "D" 33kph/21kph
About the only adjustment on that trans is the throttle link to the trans. It has a compound control of shift strength as the mod is not changing. If the shifts are too soft make it shift later and vise versa.
Bosch Master, ASE Master, L1
33 years MB technician