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Old 03-23-2018, 08:14 PM   #167
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Join Date: Nov 2014
Location: Toledo Ohio
Posts: 480
Re: 4L80E & TH400 Tech.

Okay guys, quick question. I've got a 4l80e in my 03 2500hd, the converter locks fine around town, until you're on the highway and then it will unlock after about 73mph. I read somewhere that the pcm sends a ground signal to the tcc solenoid. Is this correct?
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