If 1st through 3rd gear shifts seem to take long but O/D and lock up seem ok, then it could be the T/V cable being a little too tight. If it just seems like the O/D and lock-up take too long, then maybe a TP sensor.
IF you suspect T/V then take a click or two out of it giving the cable more slack. You dont want it too loose or make it shift too soon though. If it needs adjustment a few clicks it usually all it needs unless someone maxed it out. T/V adjustment is pretty important and if its too loose you could burn up the tranny, you will know when you are too loose cause it will start upshifting too soon.
95 ZJ 4.0L 42RE, 231, 3.5" lift 31" KM2's
"Dont let out until its too late"