Will Not Shift From 4-3
WARNING: This page is about a different car, the 2002 Infiniti QX4, 2001 Nissan Pathfinder, and 2001 Infiniti QX4. However, it is still accessible from the selected car via links, so may be relevant.
Possible cause: incorrect fluid level, misadjusted TP sensor, damaged overrun clutch solenoid, shift solenoid valve "A", line pressure solenoid valve, valve body assembly, low and reverse brake, or overrun clutch.