The 722.109 trans had an adjustable reverse band. It also had a servo piston that commonly broke or needed resealing. None of these problems should occur to a year old rebuild, but sh** happens.

Take it to Donnie or other competent shop if he is too busy. Take it too someone who can deal with incar repairs (many only exchange transmissions)

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Steve Brotherton
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician