97 probably never changed. Accessed from underneath. 2 bolts to remove the suspension bar. 1 bolt to remove the cable mount. Then you have just enough room to stick your right hand up and reach the dipstick going toward the front of the van. Used a 1/4 inch drive extension to reach the drain bolt in front of the front differential, just barely enough room. The old fluid was black with small particles. Used one can of ac Delco supercharger. Oil, 118 cc, was enough to be just below the full mark on dipstick. Used a new copper crush washer. 60 cc syringe with tubing to feed into and fill thru the dipstick hole.
Very tight but doable. I could not reach from above.