The axles would bend/snap before being able to push the differential away from the pinion gear like that. I am sure there is some movement but its the stress of the teeth intersecting on such a small surface with more pressure than they where meant to take that kills them. I went threw two 7.5's before I decided to switch to a custom 8.5 but there are alot of ways to make it stronger but it will eventually give way, the ring gear is just too small for the power these cars made stock let alone when you start modding.
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