Powerglide oil flow/pressure

I am building a portable remote oil cooler for my powerglide any idea what pump pressure i would need to circulate fluid efficiently through the transmission while it is not running?

 

it wont work..you must turn the pump to make the fluid circulate..Dave

 

looking into it a little further i will match the pressure and flow a transmission flush machine uses as it circulates fluid in the same way through cooler lines as i plan to. and removes all the fluid including convertor while the vehicle is off. Was a simple solution just never considered a trans flush machine is exactly what i am building just with a cooler attached.