An racing transmission does need to have an aux. Pump to flow more fluid, but the engine is running, therefore the trannys pump is rotating. These type of aux pumps do flow fluid faster through the system, but when the engine (or whatever turns the tranny) is not rotating the trannys input shaft - then the fluid flow is useless - meaning it will not apply pressure to the appropriate internal parts. A transmission works by transferring torque from the engines crankshaft to the rear wheels. It does this either by a manual clutch and pressure plate(manual trans) or a torque converter(auto trans). The torque converter rotates on the input shaft of the transmission. It has internal turbines that apply fluid pressure - at certain times - to the friction plates of the transmission. These turbines must "rotate" inorder for the transmission to function. The only other way to apply pressure to the friction plates is to remove the torque converter -- which makes no sense in your application.
In order for you to tow a vehicle-with an automatic transmission (without destroying the tranny) - and have the wheels rotating on the ground - you must remove the drive shaft.
BTW - I understand what you are trying to do -- "flow fluid through the tranny". Even if you do get pressure, it will not prevent damage to the transmission when you leaving the drive shaft connected.
Tuesday, September 15th, 2009 AT 4:45 AM