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To understand "lock up" you need to understand what a torque converter does.
The torque converter transmits and multiplies torque. The torque converter is a device which includes four elements:
The impeller assembly
The turbine assembly
The reactor assembly
The clutch and damper assembly
The standard torque converter components operate as follows:
Rotation of the converter housing and impeller set the fluid in motion.
The turbine reacts to the fluid motion from the impeller, transferring rotation to the
geartrain through the input shaft.
The reactor redirects fluid going back into the impeller, providing for torque multiplication.
The clutch and damper assembly dampens powertrain torsional vibration and provides a direct mechanical connection for improved efficiency.
Power is transmitted from the torque converter to the planetary gearsets and other components through the input shaft.
Basically, the "lock up" they refer to is the clutch in the torque converter locking when no more "slip" is desired, and in effect the torque converter becomes just like a clutch in manual transmission. In stock form you cannot control torque converter lock up.
Last edited by Awtblo; 03-10-2014 at 08:23 PM.