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Sonnax part #56947J-S1, "Spring, 4-3 pre-stroke valve" for transmission model 5R55N I think its a sticky valve or a broken spring.

Just happen to me today I put it in sst2 turn off traction control held the brakes in till the tires started to spin and now everything works. knock on wood. let me know if it worked for you or what you find out. Thanks Mark shaq2323@hotmail.com