This is an Eaton style rear end with a removeable center differential.It unblots from the front of the axle housing and drops out after you pull the axle shafts out and drop the driveline.Remove the ten bolts and it will nearly fall out.You should be able to drain most of the gear oil by removing the lower three bolts first.
.I have not found any 3:73 gears yet but I am told they were an option for the big-block pick-ups and suburbans(3/4 ton)


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!