4l80e p0742 Code issue

[nobox351y]

2001 5.3 with a pre case mounted neutral safety switch 4l80e 93ish swapped into a 87 r20 burb.

Took it out for the first real test drive today and all seems to function well with the exception of the this code p0742.

It seems like the converter is failing to unlock under decel. As you come to a stop the transmission pulls the engine down to about 400 rpm and then it unlocks. It threw the code and after that the converter wouldnt lock up, which is fine until I get it figured out.

Aside from checking to make sure that the tcc circuit to the brake switch has 12 volts when brakes are not applied and 0 volts when they are applied, are there any other options?

I believe I have it wired correctly but will double check that for sure.

Thanks Guys

[nobox351y]

User error...Still had parts of the 4l60 tune in the pcm. Segment swap to 4l80e settings and all is right in the world.