Remove the tail shaft . undo the pinion nut with a impact gun and pull the pinion off the shaft. Using a suitable tool pick the seal out of the housing. replace it with a new seal leaving it flush with the housing edge. Check the pinion for a groove where the old seal was running . If there is one ,fit a "speedie" sleeve ( from a bearing shop) or get a new pinion . reinstall the pinion and do up the nut until it touches the pinion on the shaft. Add up to a 1/4 more turn or less . Too much will over tension the spacer between the bearings and cause rapid bearing failure. Refit the tail shaft
SOURCE: Rear Differential Seal Leak
No. This is a cheap repair even if you take to Chrysler or any repair facility. All they do is drop the drive line and remove the pinion nut and remove the seal and tap the new one into place. Should only take them about an hour at most to do this.
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