Excessive Shock During 3-4 Upshift
WARNING: This page is about a different car, the 2002 Nissan Sentra, 2002 Infiniti G20, 2001 Nissan Sentra, and 2001 Infiniti G20. However, it is still accessible from the selected car via links, so may be relevant.
Possible cause: TP sensor misadjusted, incorrect line pressure, or damaged valve body assembly, brake band or overrun clutch.