IRS or live axle? I found the easiest way to remove the diff in an IRS corona is to unbolt the whole rear subframe from the body. There will be some bolts on the bracket above the diff and the crossmember under the back seat. The bolts for the crossmsmber are accessable when you remeve the back seat. Its the easiest way rather than fighting to undo the diff mount bolts themselves that will be caked in shit and be hell tight and have shit access. Just make sure you disconnect both brake lines before you lower rear subframe down.
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