Check for an incorrectly installed transmission, and check the drive plate for wear and damage. Replace the drive plate if it is worn or damaged.

Check the stall speed.

Check the line pressure.

Improper alignment of the ATF pump and the torque converter housing may cause ATF pump seizure. The symptoms are mostly an rpm-related ticking noise or a high pitched squeak.

Be careful not to damage the torque converter housing when replacing the main ball bearing. You may also damage the ATF pump when you torque down the main valve body. This will cause ATF pump seizure, use the proper tools.

Replace the torque converter.

Check the torque converter regulator valve and the lock-up control valve in the regulator valve body for free movement, and check the valve springs for wear and damage.

Check the lock-up shift valve in the main valve body for free movement, and check the valve springs for wear and damage.