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Re: 6L80 transmission whine at shut-off
Have you hooked it up to HPT or a pro-style scanner that can read/command trans codes?
Any chance your harness is pinned-out wrong and one of the solenoids is getting a signal it shouldn't?
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'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING 
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