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.

Inspect the differential pinion gears for wear. If the differential pinion gears are worn, replace the differential assembly, replace the ATF strainer, thoroughly clean the transmission, and clean the ATF cooler lines.

Check the ATF strainer for debris. If the strainer is clogged, find the damaged components that caused the debris. If no cause for contamination is found, replace the torque converter.

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.

Install the main seal flush with the torque converter housing. If you push it into the torque converter housing until it bottoms out, it will block the fluid return passage and result in damage.

Check the ball bearing for the mainshaft, the countershaft, the secondary shaft, and the third shaft.

Inspect the mainshaft, the countershaft, the secondary shaft, the third shaft, and idler gears for wear and damage.

Check the thrust washers on all shafts for seizure, wear, and damage.

Check the lubrication regulator valve and the lubrication shift valve in the main valve body for free movement, and check the valve springs for wear and damage.