i would run it to next oil change and not worry about it! i would be more concerned i put the correct tranny fluid in that tranny, this issue caused a lotta tranny problems around your era truck! they changed the tranny fluid specs and had people putting in whatever they thought would work which did not work? even dealers were using wrong specd fluids! hard to imagine i know!
I see where this fluid is specd for trannys using DEXII or III so if your manual says it is ok for those you have no worry, allways check fluid with tranny hot and in park engine running unless that has been changed but i do not think so and i would work the tranny thru the gears just before ya check the level!