Ford 2003 Mustang Workshop Manual page 332

sides of the cup to prevent the cup from cocking in the casting.
Installation
Using special tool 205-054
NOTE: This is the preferred method for installing the pinion bearing cups. If necessary, proceed to
Using special tools 205-153, 205-054, and 205-D055 in this procedure for an alternate method.
1. Position the special tools and the inner and outer pinion bearing cups in their respective bores.
1. After placing the inner and outer bearing cups in their bores, place the special tool on the
inner bearing cup.
2. Place the special tool on the outer bearing cup.
3. Install the special tool.
2. Tighten the special tool to seat the pinion bearing cups in their bores.
3. CAUTION: Always install new differential pinion bearings when installing new
pinion bearing cups.
NOTE: If the feeler gauge can fit between a cup and the bottom of its bore at any point around
the cup, remove and reseat the cup.