Transmission started slipping in final drive.

What year ?
If the PCM detects high torque converter slip when the TCC is commanded ON, then DTC P0741 sets. DTC P0741 is a type B DTC.
The powertrain control module (PCM) controls the torque converter clutch (TCC) solenoid valve pulse width modulation (PWM). The solenoid controls the hydraulic fluid for TCC apply and release. When the TCC is applied, the engine is coupled directly to the transmission through the TCC. The TCC slip speed should be near 0.
Diagnostic Aids
• Inspect the transmission fluid level.
• The transmission may be in hot mode. Inspect the transmission fluid lines to the radiator. The lines may be pinched, plugged or twisted.

Do you own a professional or factory scan tool ?
Install a scan tool.
Turn ON the ignition, with the engine OFF.
Important: Before clearing the DTC, use the scan tool in order to record the Freeze Frame and Failure Records. Using the Clear Info function erases the Freeze Frame and Failure Records from the powertrain control module (PCM).
Record the DTC Freeze Frame and Failure Records.
Clear the DTC.
Drive the vehicle at 72 km/h (45 mph).
Using the scan tool, command the torque converter clutch (TCC) pulse width modulation (PWM) solenoid valve ON.
Operate the vehicle under the following conditions:
• The transmission fluid temperature (TFT) is 20-133°C (68-271°F).
• The engine torque is 43-215 N·m (32-159 lb ft).
• Drive the vehicle in D4 with a throttle position (TP) angle of 10-50 %.
• Ensure that the TCC applies for more than 5 seconds.
Monitor the TCC slip speed.
During TCC application, is the slip speed within the specified parameters?

Usually a transmission slipping isn't due to the drive shaft, but the transmission itself. I know this might sound a like a crazy question, but have you checked the transmission fluid levels, could be a leak, if not full would cause slippage.

check your trans fluid, if its been a while flush it and change the filter if its reving and your speed doesnt change (slipping) if your speed changes check the TPS and speed sensors on the trans as well when you change fluid.

Need a whole new transmission, ASAP. It's a 2004 Taurus; Their transmission's tend to start slipping after so many years.

What is your question? Slipping doesn't just start one day ,out of the blue. By the time your concerned,you usually need to rebuild the trans

Please buy trans-x from autozone or which ever parts store and put in transmission. I had the same problem, used trans-x and its been three years...goodluck

you have a torque clutch problem chan your torque transmission

Check to make sure you are not low on ATF, otherwise you might need bands adjusted by transmission tech.

I would have the transmission check if you plan on keeping the car a long time. The lucas oil is an additive for the oil. The additive is making the fluid a little heavier and tricking the soleniods or clutch and bands with a different pressures.

This is a temporary fix. The transmission over time is going to start to slip more and more.

trans is on the way out