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4l80e Problems


bflat

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I have a 97 K3500. It has the 454 bolted to a 4L80E, the tranny has been rebuilt. All sensors have been replaced, torque convertor has been replaced, and even the TPS has been replaced due to some bad info an another forum. But the O.D. will work below 55 mph. Beyond that, the O.D. will kick out, RPMS jump up, then all shifts from there on out are hard and jerky until I shut the truck off.

Does anybody have a clue about what will cure this sickness?

Shift Kit?

Reprograming?

Any solid info would be grreatly appreciated.

I fear I am going to be throwing away alot more cash.

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