It is 17mm nuts that draw the transmission bell
housing to the engine, the automatic transmission to
the differential is 13mm, and where it joins it should
be smooth, no gap,(big "O" ring inside) with a gap it
should be leaking transmission fluid. that would
account for the loss of gears, also things inside are
not lined up right with it not strait, they or you
should take it out and install it correctly on the
differential. Good luck with it  Phil

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