Transmission removal I have 156000 miles on this trans. fluid was never changed. I have code faults for tcc. I believe the torque converter seals r worn. tranny still shifts but you can tell when sitting still in gear the the converter is locked. So I thought I would replace the converter.

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?

P0740 Torque Converter Clutch Circuit Malfunction Driving the vehicle with this problem and not attending to it asap may cause further damage. When you feel a problem and or see the engine light on, use your head wisely and have a reputable transmission shop go through a complete diagnostic procedure, in most cases this is a fluid problem, but since you serviced the trans that can be ruled out, if you haven't changed the TCC solenoid yet do so, I was unclear about what you replaced, I assume the shift solenoid's, if you have replaced the TCC solenoid then the problem is either in the wiring to the trans or inside the trans in the torque converter clutch circuit or the torque converter itself, which is a all to common failure in these Vans, if the TCC is ok replace the torque converter, that of course requires removing the trans, this job will require a lift, it is just about impossible on the ground.

Found that code very easily on Google. Is is a transmission code in relation to the TCC (torque converter clutch). Could be a lack of maintenance, burnt fluid or debris in the fluid. Could also be a bad TCC solenoid or another internal trans issue. You will more than likely need to visit a qualified transmission repair facility unless you are good with trans internals.

Unfortunately, the possible issues are numerous. The problem is most likely either your torque converter, or electrical issues with your transmission. Without knowing how the vehicle is acting, if it's drivable, when it trips the codes, etc, it makes it more difficult to accurately diagnose.

Here is what ford says about those codes...

SERVICE PROCEDURE
The torque converter clutch may not engage if one or more of the following conditions exist:
- Stuck converter regulator valve
- Stuck solenoid regulator valve
- Stuck bypass clutch control valve
- Stuck pressure failsafe valve
- Pump bore ring groove depth incorrect
- Worn pump shaft or damaged pump shaft seals
- Pump shaft internal sleeve loose (rattles)
- Turbine shaft seals damaged or missing
- Incorrect Torque Converter Clutch (TCC) solenoid
- TCC solenoid mechanically stuck or electrically inoperable
- Damaged internal wiring harness
- Incorrect gear ratio (wrong sprockets)
- Damaged or worn stator support
- Worn torque converter hub bushing
- Torque converter clutch worn or damaged
Use a scan tool to monitor the following PID's:
- TCC = Commanded duty cycle for TCC solenoid
- TCCMACT = Actual slip across the TCC, measured in RPM
- RPM = Actual engine speed
- TSS_SRC = Actual turbine shaft speed
- TCCRAT = Speed/Gear ratio of torque converter/transaxle

Hope this helps.

Ruled out how?

You still have codes for something

Changing trans fluid only gives you
new fluid,not a fix for anything,just
disapates heat better with new fluid

The codes are for torque converter clutch,so why not
diagnose the TCC Solenoid

P0743 - Torque Converter Clutch Circuit Electrical
Possible causes- Faulty torque converter clutch solenoid valve
- Torque converter clutch solenoid valve harness or connectors
- Torque converter clutch solenoid valve circuit is open or shorted
- Low transmission fluid level
- Dirty transmission fluid
Tech notes This is an electrical problem code. Could be a problem to the harness to the TCC solenoid, the TCC solenoid connector or the TCC solenoid it self.
P0755 - Shift Solenoid B Malfunction
Possible causes- Low transmission fluid level
- Dirty transmission fluid
- Faulty shift solenoid B valve
- Shift solenoid B valve harness or connectors
- Shift solenoid B valve circuit is open or shorted Tech notes When the a transmission solenoid is malfunction, in most cases the problem is not the electrical part of the solenoid; the problem is foreign material obstructing the mechanical function of the solenoid or the flow of the fluid through the transmission valve body. If the transmission fluid is very dirty, it is recommend changing the transmission fluid and if possible removing the transmission pan for further diagnosis. Excessive debris or metal particles on the transmission pan could be an indication that there is a transmission mechanical failure and that the transmission will need to be rebuilt or replaced.

Read more: http://engine-codes.com/p0755.html#ixzz27PjeNdA5

CODE PO741 - TORQUE CONVERTER CLUTCH SYSTEM STUCK OFF WHEN THIS CODE COMES UP YOUR TRANSMISION FLUID TOO LOW OR FLUID + FILTER NEED CHANGING YOU HAVE A RESTRICTION IN TRANSMISSION LINES TO RADIATOR CHECK TO MAKE SURE LINES NOT BENT IN ANY WAY.TCC FEED VALVE OR TCC REGULATOR VALVE IS STUCK OFF DUE TO SEDIMENT OR BINDING.THE OIL PRESSURE SCREEN IS CLOGGED OR DEBRIS IN THE OIL PAN.TAKE CAR TO A TRANSMISSION SHOP GOING TO COST YOU.YOU NEED TRANSMISSION FLUSH AND YOU NEED A FILTER AND FLUID CHANGE.ITS NOT CHEAP FIX BUT YOU CAN CHANGE FLUID + FILTER YOUR SELF TO SEE IF IT HELPS BUT BEST TO HAVE SHOP TO FLUSH OUT TORQUE CONVERTER. PUT NEW TRANSMISSION FLUID IN THE ENTIRE SYSTEM SOUND LIKE OLD FLUID CONTAMINATED WITH SEDIMENT NEED TO GET IT ALL OUT TRANSMISSION.

"The 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.

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.

Conditions for Running the DTC
• No TP DTCs P0121, P0122 or P0123.

• No VSS DTCs P0502 or P0503.

• No AT ISS DTCs P0716 or P0717.

• No TCC stuck ON DTC P0742.

• No IMS DTCs P1820, P1822, P1823 or P1825.

• No TCC PWM solenoid valve DTC P1860.

• The engine run time is greater than 5 seconds.

• The time since the gear select lever change is greater than 6 seconds.

• The IMS indicates D2, D3 or D4.

• The transmission gear ratio indicates 2nd, 3rd or 4th gear.

• The transmission fluid temperature is 20-133°C (68-271°F).

• The TP angle is 10-50 percent.

• The engine torque is 43-215 N·m (32-159 lb ft).

• The TCC solenoid valve is commanded ON.

Conditions for Setting the DTC
TCC slip speed exceeds its limit for a given torque for 5 seconds.

Refer to Torque Converter Clutch Slip Speed .

Action Taken When the DTC Sets
• The PCM illuminates the malfunction indicator lamp (MIL) during the second consecutive trip in which the Conditions for Setting the DTC are met.

• The PCM inhibits 4th gear if the transmission is in hot mode.

• The PCM records the operating conditions when the Conditions for Setting the DTC are met. The PCM stores this information as Freeze Frame and Failure Records.

• The PCM stores DTC P0741 in PCM history during the second consecutive trip in which the Conditions for Setting the DTC are met.

Conditions for Clearing the MIL/DTC
• The PCM turns OFF the MIL during the third consecutive trip in which the diagnostic test runs and passes.

• A scan tool can clear the MIL/DTC.

• The PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles without an emission-related diagnostic fault occurring.

• The PCM cancels the DTC default actions when the ignition switch is OFF long enough in order to power down the PCM.

Torque Converter Clutch. It has to do with the transmission. It could be a small issue such as a trans. fluid and filter change. Or could be the solenoid failing. At worst, the torque converter is shot...transmission failure.

DTC P1744 is "TCC - Excessive Slip Detected During Full TCC Engagement". Which means that the Torque Converter Clutch (TCC) is disengaged or the EPC pressure is at the minimum.

The most likely cause is a sticking or bad TCC solenoid inside the transmission. You can check the connector at the transmission to make sure it is clean and tight and that it is not damaged in any way.

If the TCC and wiring is okay, then pressure testing of the transmission will need to be done.

A new torque converter from Ford is about $265.00 and about 4 hours labor. Throw in a $40.00 TCC solenoid and I don't think it'll be more than $700.00 at worst.

If the pressure test is good then it's just going to be the $40.00 tcc solenoid and the cost of the transmission oil and filter changed which should be around $150.00

Good luck and hope it's just a loose wire harness to the solenoid which would cost $0.00 and just your time to locate the break in the wire. The other thing to, is to add a transmission fluid additive that would restore the clutch pack in the transmission and Torque Converter.