Honda Acura NSX 1991 Service Manual page 402

Description
Power Flow (cont'd)
Position, 4th speed
1.
Hydraulic pressure is applied to the 4th clutch, which rotates together with the mainshaft, and the mainshaft 4th
gear rotates.
2. Power is transmitted through countershaft 4th gear to the countershaft.
3. Power is transmitted to the final drive gear and drives the final driven gear.
NOTE: At D position, 4th speed, hvdraulic pressure is also applied to the 1st clutch, but since the rotation speed
of 4th gear exceeds that of '1st gear, power from 1st gear is cut off at the one-way clutch.
1 ST CLUTCH
\
ONE-WAY CLU
14-14
MAINSHAFT
4TH GEAR
FINAL DRIVEN GEAR
TORQUE CONVERTER
UNTERSHAFT