Four speed automatic without lockup torque converter. The automatic transmission no longer had a lockup torque converter. Four speed automatic with lockup torque converter and electronic controls. Some users have complained of CPU lockup caused by overheating. Slipper clutches can also prevent a catastrophic rear wheel lockup in case of engine seizure. Torque converter lockup in 5th and 6th gears. It was available both with and without a lockup torque converter. The torque converter can lockup from 2nd to 6th gears. The torque converter can lockup from 2nd to 8th gears. Torque converter lockup in 4th, 5th and 6th gears. This caused all sorts of issues like being unable to boot or hard lockup/freeze. This was covered in the documentary "Lockup&colon; Holman Correctional Facility" (2006), which MSNBC produced. This tends to give the driver better "feel" and helps to avoid impending lockup. The police claim that this was done to prevent lawyers from breaking into the lockup. The "KM148" automatic transmission was replaced by the "V4AW2" with lockup.