Hi Gang, Here is the background: 1998 Pontiac Bonneville, 3.8L 4T65E transmission. Came in with a P0742 TCC Stuck On and P1811 Max Adapts. In testing the vehicle I found No 4th gear, Pressure going Max to try to apply 4th (hence, P1811) and L/U was coming on t... Login to read more.