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You are lucky you caught it. There should be a pin that probably got sheared off on the leaf springs, the bolt that holds the stack together. Re-using or not re-tightening the u-bolts cause that..
there should be a bolt going threw the springs and a pin on the bottom of the block, it doesnt look like anything is there. ive never see a block thats angled like that they all have 90° on them. but yeah good thing you did catch it, at the very least you would of binded up the u-joint causing it to break then the driveshaft would of smacked everything else. do you know where those blocks came from? but i think the blocks are your problem, i would replace them with a straight one. you dont have lift blocks upfront do you?
You can use no block lift springs with extended shackles.