Mustang GT V8-4.6L SOHC VIN X (1998)
4. While holding rear axle universal joint flange with Companion Flange Holding Tool 205-126 (T78P-4851-A), remove pinion nut.
5. Clean area around rear axle drive pinion seal. Place a drain pan under rear axle drive pinion seal or raise front of vehicle higher than rear.
6. Mark rear axle universal joint flange in relation to pinion shaft so rear axle universal joint flange can be installed in same position.
7. CAUTION: Never remove the rear axle universal joint flange with a hammer.
Remove rear axle universal joint flange, using 2-Jaw Puller D97L-4221-A or equivalent.
8. CAUTION: Do not damage rear axle housing while removing rear axle drive pinion seal.
Position screwdriver under flange of rear axle drive pinion seal and strike with hammer to wedge screwdriver blade between metal flange of rear
axle drive pinion seal and rear axle housing.