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The band servo piston is for the band that disengages when fourth gear is applied by clutch pack. Third gear is a clutch pack applying. Unfortunately you probably have a pressure plate lip seal bad combined with a lot of clutch disc wear.
That means rebuild. Your choices as I see it, are to set your shifts up earlier and increase the modulator pressure and learn to drive with it if possible or fix it.
If you haven't done it recently you should remove the pan, replace the filter and evaluate what is in the pan. If you are getting any metal its time.
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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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