Doing shakedown drives on my Imperial's new powertrain. Discovered that the A999 automatic in the car doesn't seem to have third gear at all. In drive at low throttle, the first-second shift feels fine and then feels like I've left the car in "2". Reverse functions fine, no banging or other concerning issues. Manual shifting first-second works, does not work second-third. I'm still fabbing up a fully functional kickdown system, but for part-throttle use I've set the kickdown pressure to about 25% and I have not gone better than half-throttle for any measurable amount.

Where do I start troubleshooting...the valvebody? Everything else about the transmission feels right, just the missing third gear, and I'd like to see if it's something simple before it's time to make an appointment with a trans shop.