Differential upgrade ???

Hey guy so i recently got a 2" lift kit and a 2" body lift on my 2010 tacoma and installed 35" Cooper tiers on 15" steel rims.
after almost 3 months of the lift my rear U joint flange broke off


Anw I've read an article that it was kind of a weak point so i changed both front and rear and changed the 3 U-Joints.
But while test driving it i heard a small knocking sound from my diff when i accelerate from a stand still violently.
Any ideas what that might be ? And any advice about any upgrades i can install on the current diff to make a bit tougher ?

 

I have spidetrax wheel spacers installed