4l80 not shifting 2nd to 3rd

[andy396]

Maybe this

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More than you may “need” but not a bad idea.

 

[ginoz28]

Cheap insurance so I'm not stuck on the side of road anytime soon.

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[Supercharged111]

Cheap insurance so I'm not stuck on the side of road anytime soon.

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The internal harness may fail on you too. At the least I'd recommend a new harness and potting it with silicone. I went through this on my own 4L80 rebuild. While the harness worked fine, the damned plug in the case leaked. I also managed to bust a shift solenoid and some connectors on my 4T60 harness on the wife's GTP.

 

[ginoz28]

Yea when I unplugged this one it was full of fluid. Ill replace everything in the kit.

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[ginoz28]

Finally got to put the kit in the truck but it didn't work with the stock harness plugged in.Only when I plug the ebay bypass piece in it shift through all the gears manually.

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[andy396]

Finally got to put the kit in the truck but it didn't work with the stock harness plugged in.Only when I plug the ebay bypass piece in it shift through all the gears manually.

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So does this confirm it’s going into limp mode from something like a bad input speed sensor?