The reverse clutches failed. This is the most common problem that trans ever has. In the later cars (yours is a later car) the pressure plate retaining spring plate deforms and lets go releasing 20 or so clutch springs making a mess of it. Not really any worse though just requires the springs and a plate and occasionally a drum.

While this clutch is the first one to be removed on disassembly, the occurance of debris requires a complete disassembly and cleaning. All clutches, an occasional band, all seals, a thrust bearing or two and its like new. The short story is that it needs rebuilding.

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