The reverse on this tranny uses a clutch setup that you can access after taking out the front pump. It is a large set of discs.
What I have seen in the past is the pin breaks off of the apply piston and hangs it forward.
You will have to take out the tranny for inspection, but this could be the cause.
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Benzmac:
Donnie Drummonds
ASE CERTIFIED MASTER AUTO TECHNICIAN
MERCEDES SPECIALIST 11 YRS
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