Ahhh I see what you're saying. Now that makes sense.Sounds like you may have found your issue. The two 60mm bolts attach the rear cover to the diff mount. The 80 mm bolt attaches the diff mount to the subframe assembly. I think you know what you have to do from here.
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Thankfully, I never took that mount off. So we're good to go there. Although I should have at least checked to make sure it was still tight.