noise isolater and new negative battery connections...
 

But the torque converter is still unlocking between 50-68mph. The only thing I haven't tried is moving the ground off of the alternater (loops around the front of the alternater and bolts to the block) ovrr to just the negative battery or to the fender. I also heard you can wrap that wire with aluminum foil and electrical tape to keep frequencies out but I figured the noise isolater would cancel all of the noise out...could it just be a weak/bad tc or am I missing something?

The truck im having problems with is my 1996.

Have you checked to make sure your tps is reading correctly?

No I haven't. How do I do that? Tps would cause the tc to unlock?

Yes it can. You can get initial readings by watching with a scan tool. You can also check with a multi meter on ohms. With either tool you sweep the tps and look for reading to drop out. Its best to use a scope but, not always necessary. Also if the linkage has slop in it on a 12v it can cause the tps reading to jump around.

Thanks for the reply. Do you know where I can find instructions on checking the ohms?

ive run into this before, have you completely unhooked your alternator, grounds, power, everything? and drove it?

No I haven't. What does this do? Cancel out the noise?

if the alternator is the cause it will eliminate it, and your tc will function normally

Thank you gentlemen I will try both fixes and post on here when it is fixed...