I know my fair share about manual t-missions cuz ive rebuilt them, but ive never had the chance to tear into an auto, what are people talkn about when they talk about a tq conv. stalling up until a certain RPM and just ouuta curiosty, how could this help you if your pulln somthn?

The torque converter is your clutch. At low rpms, the blades of the stator and impeller in the TC are "slipping" as the fluid circulates around them and your clutch is "disengaged." There is some fluid coupling caused by the fluid flow around the blades, which is what gets you rolling when you let off the brake and start to give it gas. As you accelerate, the speed of the input section starts to couple more and more as the fluid tries to resist flowing around the blades and this is also assisted by centifugal force as the housing spins faster. There's a point, called "stall speed" (in rpms) where this effect becomes as good as it's gonna get. For constant speed and towing (when you are not shifting and don't need to be "clutched") there is an electromatic locking clutch that will "bind" the two pieces of the TC together mechanically until the tranny senses an impending shift. This is called "TC lock" or "lockup" to make the system more efficient. Stall speed is set by the design of the TC and a lower stall is important to get things moving when towing, but if you stall too low, you put too much resistance in the system when not moving - kinda like slipping your manual clutch at a stoplight - which produces a lot of extra heat in the fluid.

solid explanation thanx

There are two counter opposed impellers in the converter one is driven by the engine and it causes the fluid in the converter to rotate, the other impeller with an opposite pitch is turned by the fluid motion and is connected to the input shaft of the trany. In lockup operation the two implellers are mechanicaly connect hense no slippage. The allison in tow haul locks up in all but 1st gear and not in tow/haul in 4th and 5th. The fluid in the converter is the fluid from the trany and the slippage of an unlocked converter causes heat buildup and it will run cooler when locked.