I have to rev to 4500-5000 revs before the auto box changes up the gears. The filter and fluid have been changed in the box with no results. please help.

Check your kickdown switch. The best way is to just disconnect the wire from the solenoid at the right rear of the trans. This assures that there is no form of electric kickdown. If that stops the problem look to the switch. Its usually the switch.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician

If that doesn't fix it check the white vacuum line from the inlet manifold to the transmission.

Attached Images

vac2.jpg (56.8 KB, 61 views)

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Mick J
'08 Chrysler 300CRD (MB OM 642 engine)
'95 E220 estate
'89 230TE (R.I.P.)