"My thinking is the check valve for locking up the torque converter is letting enough fluid by that it allows the torque converter to slip slightly there for telling the computer to unlock. What do you all think? "
I think your thinking is likely flawed, the 'puter is looking at LOTS of things other than TCC slip, mainly engine loading.
By '98 they'd gone to a PWM TCC engage, which allows slippage as decided by the 'puter, and not an instant lockup.
They redesigned the convertor clutch for longevity with slipping.
I'd GUESS the "issue" you are seeing is more of a software issue than a "hard" failure in the transmission, not sure what all is out there for tuning a '98, but if possible, some changes could probably be made from that end.
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Today's Featured Article - A Brief History of Tractors in Australia - by Bob Kavanagh. After Captain Cook's exploration of the east coast in 1770 the British Government decided to establish a penal colony in Australia. The first fleet arrived in 1788 and consisted mainly of convicts who were poorly equipped and new little of farming techniques. The colony remained far from self-supporting and it was not until the early 1800's that things started to improve. Free settlers started to arrive, they followed the explorers across the mountains and where land was suitable set up farms. T
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