It sounds like you have a broken pressure regulating solenoid which slows down the shift engagement. This mean the transmission will need to come apart to replace the solenoid. The pan must be removed, here are some guides to help you get the job done.
to pull the pan
Detailed diagrams (BELOW)
Raise vehicle on hoist.
Remove valve body assembly from transmission.
Remove Solenoid/Pressure Switch Assembly retaining screws (2) from solenoid.
Please let us know what happens.
Images (Click to enlarge)
Thursday, May 11th, 2017 AT 12:25 PM