Honda Acura NSX 1991 Service Manual page 383

Transmission
b. Lower the transmission housing, then place the
shift arm in the groove of the shift piece by turn-
ing the shift lever.
TRANSMISSION HOUSING
SHIFT
ARM
13-46
13. Lower the transmission housing with the snap ring
expanded and set the snap ring in the groove of the
countershaft bearing.
SNAP RING
14. Check that the snap ring is securely seated in the
groove of the countershaft bearing.
Dimension A as installed: 1.60-8.15 mm
(0.0630-0.3209 in)