Acura NSX 1997 Service Manual page 344

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5. Install the spring washer, then insert the mainshaft
and countershaft into the shift forks and install
them as an assembly. Tape the mainshaft splines
before installation.
6. Install the change holder assembly in the clutch
housing. Place the interlock finger in the groove of
the select arm.
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7. Install the reverse idle gear shaft assembly.
8. Shift the reverse synchro sleeve to the driven gear
side, then install the reverse shift fork assembly.