Manual Third Gear: Notes
WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
When the gear selector lever is moved to the Drive Range (3) position, the manual valve also moves. This allows line pressure to enter the D321 fluid circuit. The torque converter clutch releases in the same manner as previously described. Refer to Overdrive Range, Fourth Gear - Torque Converter Clutch Applied , but the torque converter clutch may reapply when the appropriate operating conditions of the vehicle have been met.