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  #1  
Old 11-13-2002, 02:13 PM
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Join Date: May 2002
Location: Chicago
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W126 auto trans...slips out of gear on upshift

1984 500SEL (euro model)...On normal accelleration, car shifts up through gears, but between 2 and 3 (possible 3 and 4 also) it slips out of gear momentarily. If I keep pedal down, it slips back into gear with a noticable clunk. This doesn't seem to happen if I drive around in "3" instead of "D". In general, the kickdown from 4th into lower gears (under 1/2 to full accelleration) has a delay, then a good hard clunk. I am going to check vacuum and bowden cable for the hard downshifting, but the false neutral thing scares me a bit.

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Old 11-13-2002, 02:43 PM
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Join Date: Jul 2001
Location: Oklahoma Sooners Alumnus
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Sounds like your modulator valve is either bad or not getting vacuum.

And I am sure that you are keeping the fluid at the right level. If it gets to low it will do that.
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Old 11-13-2002, 03:47 PM
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First you should adjust the link at the back of the motor to the control pressure cable. Mark what you have and lengthen it an 1/8 inch. Try this for a few days. If it isn't enough try turning the modulator adjustment a turn clockwise. Maybe both maybe more one than another, but do the cable first maybe twice.

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