Forward Clutch Drum

WARNING: This page is about a different car, the 2004 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.

Make sure that check balls are not fixed.
Apply compressed air to check ball oil hole from outside of forward clutch drum. Make sure air leaks past ball.
Apply compressed air to oil hole from inside of forward clutch drum. Make sure there is no air leakage.

Fig 1: Checking Air Leakage (Forward Clutch Drum)
Courtesy of NISSAN MOTOR CO., U.S.A.