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There's one bolt at the top back and one at the bottom front of the diff.
 

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Bolt with orange mark on it is bottom front bolt.



And these two are of the top bolt. It also has an orange mark on the bolt head.



This is the other side showing the nut.

 

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If you have tightened the two bolts and it's still wiggles, check the tabs. You may have a broken tab or a bad weld on the tab. It happened to me in the front diff.


FYI: grap the diff and shake, not the axles. The axle's do wiggle a little and that's normal.
 

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So the actual diff moves in the frame or are you just seeing the axles moving? If your diff is moving I bet your bolts were loose and from the toqure of the engine you enlarged the mounting holes. Ouch. If this is the case you'll have to weld some washers to the tabs in the correct locations to stop it from moving. I did this fix to my right upper a arm mount. The previous owner did something and left the nut and bolt loose and it enlarged the hole and my a arm would shift even with the bolt fully tight so I welded a harden washer in the correct position and she's good as new now.
 

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No wiggle at all. remove one of the bolts and see if the frame is "egged out" .
Fairly easy fix if it is, just time consuming.
 
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