Brock, this is a picture of the trans resistor to disconnect in the engine bay:
What I'd suggest you'd try is draining your trans and adding two bottles of Lucas Oil Auto Trans additive along with regular ATF fluid.
That Slick 50 could very likely have caused the problem. Some people add a 1/4 bottle to their trans to stop the transfer clutch from locking up (in awd models). If you added a full bottle to your trans, then a good portion of that additive will still be in your tranny right now (even after draining it once).
-Chike