OD Lock up question

[Sgt Hollywood]

Okay, so I've been searching and reading all over the interweb to diagnose the issue I'm running into.

87' SWB - 350tbi - 700R4 - 3.08

So, here's the issue, when I gently (low RPMs easy on the pedal) drive, it appears that the TC is locking up in 2nd (mostly) and 3rd. Locks up then disengages. This doesn't happen all the time however.

Like its hunting.

It actually happens in Drive and OD. If I go a bit harder with the gas it doesn't seem to happen, but that could just because the TCC isn't getting the signal.

Unplug the TCC and its gone. Runs and shifts fine, just no Lock Up.

TV cable is adjusted correctly. Fluids all check out, I had installed a new TCC about 2 years ago. My speedo does fluctuate a bit sometimes maybe 1 to 2 mph. so maybe the VSS is getting a funky signal.

Maybe the Replacement TCC is failing?

I am temped to just put a toggle on the TCC since I really only want 4th OD for highways.


Any Ideas?

Thanks.