People i work with always tell people to try that Lucas tranny stabilizer fluid. I dumped it in my truck and it seems to shift nicer, i have the 4l30 as well, but in a 92 rodeo. if the tranny filter hasnt been changed, id change it, add new fluid then add the lucas tranny fluid additive. Not sure about the clicking sound though.

92 Rodeo, 3.1 TB crank, custom bumpstop spacers, DOR shackles, Flipped ball joints, D44 Rear, 4.56s and new magnaflow cat and dynomax ultraflow muffler Since been replaced by a 2 door Explorer on 31's shackles, cranked torsion bars and full exhaust