Unbolt the drive-line.

Remove the bolts holding the axle shafts in(they are out by the wheels on the end of the hub).Remove the axles(pull out)
Remove the bolts holding the differential unit in the housing.
Remove the differential.
Clean out the housingand clean (if you already haven`t ) the new donor differential.
Install your new differential.
Install your axles.
Fill with oil and hook up the drive-line!

You may want to remove the hub and brake drums so you can clean and inspect the bearings and seals.

Have fun and remember to recalibrate your speedometer!

There is enough good in the worst of us and enough bad in the best of us that it does not behoove any of us to criticize the rest of us.
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Be yourself. If you are ever lost, It will be much easier to find yourself if you know who you are!