Gears are slipping

Welcome to 2CarPros.

It sounds like the shift cable has either come loose, disconnected, or it has broken. I am going to provide the directions for removal and replacement of the cable. I'm not saying it needs replaced, but the directions will indicate all the locations that need to be attached and stationary. Take a look through them and let me know if it helps. The attached pictures correlate with the directions. Note that the directions are for a column shift. If you have a floor shift design, let me know.

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2007 Ford Taurus V6-3.0L VIN U
Selector Lever Cable and Bracket - Column Shift
Vehicle Transmission and Drivetrain Automatic Transmission/Transaxle Shift Linkage Shift Cable Service and Repair Removal and Replacement Selector Lever Cable and Bracket - Column Shift
SELECTOR LEVER CABLE AND BRACKET - COLUMN SHIFT
Selector Lever Cable and Bracket - Column Shift

pic 1

Removal
1. Remove the LH lower instrument panel trim.
To install, tighten to 7 Nm (62 inch lbs).

Pic 2

2. Reach up from the left side of the column, then using a small screwdriver, pry the selector lever cable from the selector lever pivot ball.

Pic 3

3. Remove the selector lever cable from the retaining bracket by carefully lifting up on the locking tab while pulling up on the selector lever cable fitting.
4. From the engine compartment, remove the cruise control actuator. For additional information, refer to Cruise Control.
5. Pry the selector lever cable grommet from the dash panel.

Pic 4

6. Remove the nut holding the selector lever cable to the manual control lever.
To install, tighten to 20 Nm (15 ft. Lbs).

Pic 5

7. Lifting up on the locking tab while pulling up on the selector lever cable, remove the selector lever cable from the transmission selector lever cable bracket.
Discard the locking clip.

Pic 6

8. Pull the selector lever cable through the dash panel opening.

Installation
1. To install, reverse the removal procedure. Using a new locking clip, adjust the shift cable. For additional information, refer to Selector Lever Cable Adjustment - Column Shift.

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Let me know if this helps or if you have other questions.

Take care,
Joe

Welcome back:

It does. Here are the directions for the floor shift:

2007 Ford Taurus V6-3.0L VIN U
Selector Lever Cable and Bracket - Floor Shift
Vehicle Transmission and Drivetrain Automatic Transmission/Transaxle Shift Linkage Shift Cable Service and Repair Removal and Replacement Selector Lever Cable and Bracket - Floor Shift
SELECTOR LEVER CABLE AND BRACKET - FLOOR SHIFT
Selector Lever Cable and Bracket - Floor Shift

pic 1

Removal
1. Remove the center console. For additional information, refer to Console.
2. Disconnect the selector lever cable from the selector lever.
Remove the selector lever cable from the transaxle range selector lever.
Depress the tab on the selector lever cable and remove the cable from the selector lever housing.

Pic 2

pic 3

3. Remove the rear air distribution duct, if necessary.

Pic 4

4. Disengage the rubber grommet from the bulk head.
Working from the passenger compartment, pull the insulation back to access the rubber grommet.
5. Remove the selector lever cable from the manual lever.
To install, tighten to 20 Nm (15 ft. Lbs).

Pic 5

6. Depressing the tabs, remove the selector lever cable from the transmission shift cable bracket.

Pic 6

7. Feed the selector lever cable inside the vehicle and remove.

Installation

1. NOTE: From inside the vehicle, feed the selector lever cable through the floor.

To install, reverse the removal procedure.
Place the selector lever in OVERDRIVE, then attach the selector lever cable to the selector lever.
Move the manual lever to OVERDRIVE, then install the selector lever cable onto the manual lever.

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Let me know if this helps and what you find.

Joe