Late shifts after new torque converter.

No, I bought the transmission from Performance Automatic Transmission with the shift kit in it. The only modification I've done is changed the spring for the 1-2 shift to be higher but that was months ago.

Might want to see where that PR Adjustment is at when you get the pan off. There was a big difference here between the Stock Adjustment Setting and the Transgo Recommended setting. Had to back it off quite a bit, as the Transgo Kit reroutes the internal passages of the valve body.