personally if the trans isnt givimg you and issue and the fluid looks good, i wouldnt mess with it. if u wanna service it, change filter but keep old fluid.
wat cat mod t fiddle? only thang is the trans vibrates a little wen shiftin to 3rd i thank , my old green 97 2wd done that also and sfb89 screw does it too ...... it just seems sluggish , gonna change the fuel filter and see if that helps ..... also pickin up a sct livewire programmer