convertor unlocks occasionally ONLY when it rains.

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BOTTLEDZ28

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98 Tahoe 4x4 4l60E. Convertor unlocks while driving but it only does it when its raining out. Its been doing it for over a year now. My ride to work is about 7 miles with most of it on the highway. In that 7 mile ride, it will do it about 4 times on average. Some times, it will do it once or twice. Two weeks ago, it did it about every 1/4 mile and it was pouring out. I cant figure out whats happening here. Is something getting wet? I cannot confirm if the brake lights are lighting up when it does it which could rule out water getting into the taillight wiring. I'm just stumped here. Any advice??
 
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