Re: 4L80 damaged
4wd 4L80E's don't have a OSS (Output Speed Sensor) Reluctor Wheel on the Output carrier.
I can see using the ISS (Input Speed Sensor) which is actually the Forward Drum Speed with a aftermarket controller & have the false sense of the trans shifting correctly....But it's NOT.
As your NOT using a factory controller (PCM/TCM), They can't definitely say that using the ISS by itself caused a failure.
If the Output shaft was too long & was pushing on the trans geartrain....That can cause several problems in the trans & T-case.
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