Checkball #2, 4, 8 or 12

Valve body checkball in wrong location or an additional checkball is installed. Refer to Control Valve Body Installation in Transmission Unit Repair Manual-4L60-E/4L65-E.

Orificed Cup Plug (240)

Not fully pressed into pump cover. Refer to Oil Pump Stator Shaft Bushing Replacement in Transmission Unit Repair Manual-4L60-E/4L65-E.