4L80E, Tuning Help

[Buick Motorsports]

Hey Guys,

Got reacquainted with a fellow gearhead tonight. He tells me that he's put a 4L80E in the car. He cannot get the tune right and there seems to be no one here who can help him and the TCI help line didn't pan out for him( I didn't ask for the details.

I told him that I would ask the collective knowledge of Lateral-g for help.

Here is the specs:

1956 Chevy
502 (500 - 550hp @ crank ) naturally aspirated
4:56 gears
4L80E is stock gearing, the tranny shop put in a "stage 2 shift kit"
TCI computer and harness

All he wants is a factory tune that will behave predictably. Here are 2 symptoms of the tune:

- when he gets on the throttle, the trans will not shift unless he lifts the throttle.

- when he is rolling @ 5 - 8 mph, and he ratchets down to first gear, the car almost comes to a complete stop. He says it feels like its going to throw him through the window.

Those are the basics, hope that you Guys can maybe give us a hand.

Thanks.