Ford 4L3Z-7000-CA Automatic Transmission Assembly

Prior to installation, make sure the torque converter is securely engaged in the pump. If you've removed the converter, apply a small amount of transmission fluid on the torque converter rear hub, where the transmission front seal rides. Install the torque converter onto the front input shaft of the transmission while rotating the converter back and forth. It should engage into the transmission front pump in stages. To make sure the converter is fully engaged, lay a straightedge across the transmission-to-engine mating surface and make sure the converter lugs are at least 3/4-inch below the straightedge.

It is necessary to establish whether the fault is electrical, mechanical, or hydraulic in nature before repair work can be contemplated.