1996 Dodge Ram return line fluid pressure at idle

i have a 96 ram 1500 with a 5.2 and a 46re 4spd
overdrive,i removed the trans fluid return line at idle hot and the fluid was at a very slow trickle- what should the trans fluid pressure be at the return line from the radiator at idle ?,also is their a check ball in the trans fluid delivery line to the radiator,never had a trans flush/purge ,
seems to be alittle weak at acceleration but then shifts fine .any info would help,thanks.