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Message: [QUOTE="mandkole, post: 1215882, member: 4630"] I toured the wiring of the TC lock switch put in by the PO and looked at the harness for any unusual damage or other tampering. In the way its wired, the PCM signal for the TCC has to go through this 9pin, 2 position switch before making its way to the trans. Its a very simple wiring similar to what is described by DIs old information (unlike the Guzzle box). It could stand to be rewired, but its very functional. I then pulled the solenoid pack plug and found it full of ATF. May have found the issue. I blew it out good on both sides and removed about a 1/2 thimble full of fluid. Went on test drive-- started very normal until I encountered a short little hill after slowing for a car that put me at about the slowest speed possible in top gear before it would want to backshift to 3rd. I accelerated and it commanded an unlock, then relocked. To me it felt like it should have commanded an unlock but it was very brief and similar to the others. Got out to the interstate and it never attempted to unlock on the on ramp like many times before, acting very normal. Ran fine all the way back to the house. Fluid temp at 100 over ambient after drive. Since the larger tires, the fluid definitely heats quicker. I don't know how the solenoid pack is built, but it seems that the pack may be compromised. Im also still wondering about the calibration of vehicle speed to throttle position and the impact that the 10% larger tires may have and the speedo was not reset. Im hopefully getting more confirmation that the trans is not having mechanical issues. [/QUOTE]