Explorer 4WD V6-4.0L VIN E (1999)
11. Using the special tool and a suitable press, seat the pinion bearing firmly against the pinion gear.
12. Place a new collapsible spacer on the pinion shaft against the pinion stem shoulder.
13. Install the pinion assembly (pinion, shims, inner pinion bearing, and collapsible spacer) into the rear axle housing bore.
14. Install the outer pinion bearing.