Not in gear

Select D, Drive.

Low fluid level, aerated fluid

Add fluid to the proper level. Refer to Transmission Fluid Check .

Faulty torque converter

Replace the torque converter. Refer to Torque Converter Replacement .

Incorrect torque converter

Replace the torque converter. Refer to Torque Converter Replacement .

Clutch pressure low

Refer to Low Main Line Pressure in Specific Ranges, Normal Pressure in Other Ranges .

1-2-3-4 or low and reverse clutch slipping.

Use the diagnostic tool to measure turbine speed.

Rebuild the 1-2-3-4 clutch or the low and reverse clutch.

Higher power engine

Confirm proper engine match.