Sorry for reviving such an old thread but it's about all I can find by searching 'pulse width modulated'.
I just rebuilt the 4L60E in my 96 ws6 with the TCI-378950 overhaul kit, Transgo reprogramming kit, and a few other hard parts and a TCI 3000 stall with 12" lock-up clutch # 243106. After a couple of valve boby adjustments, the transmission shifts just fine. But the converter has been having problems locking up from the beginning.
With my original madz28.com tune, the converter was locking in 3rd gear at part throttle, but it was taking like maybe a full second to get locked. Then yesterday leaving work it started bucking in and out of lock-up when it tried to lock. Now I can't really feel it trying to lock and when I accelerate from a highway cruise, the RPM's increase like the converter clutch is not holding. I'm afriad I've burnt the converter clutch.
I have reflashed the PCM with a modified version of the madz28 tune that only locks the converter in 4th gear but I'm probably a little late to save the converter clutch.
Before replacing the converter, what can I do to make the new converter lock correctly?
Is there any way to by-pass the 'pulse width modulated' TCC apply control? Even a manual switch if I need to?
I have been told that the PWM converters use a special clutch material to withstand the added heat created by the PWM system, but Summit's listing for the converter shows:
TCI-243106
Make CHEVROLET
Transmission Type 4L60E
Torque Converter Usage Street/Strip
Beginning Year 1992
Ending Year 2000
Drivetrain RWD
Bellhousing Bolt Pattern Chevy

It is my understanding that the PWM control was not used until 95 {as stated in the quote above}. Which clutch material does the 92-00 TCI converter have? If it is the material used in the pre-PWM units, then maybe that could be why my converter clutch did not last.
Thanks for any help on this matter.

 

Make sure your TCC solenoids are functional, especially the one with the long plastic snout (up by the pump). Make sure it is not cracked. Check their resisitance. The PWM valve bodies are also known for wearing out the valve bores. Sonnax has a reamer and oversized valves to repair this. I would check the wiring harness for continuity too. Should be some easy stuff to check before pulling the converter and transmission back off.

I am right in the middle of my 3rd rebuild (split rear planetary), so I feel your pain .