Possible front diff failure?

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Discodisco

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Picked up a 2007 base Escalade for peanuts and I’ve been fixing little things here and there. I’ve had an intermittent clunk when it shifts under light load which I’ve managed to replicated by shifting back and forth while
Stationary from drive to reverse, with my kid shifting it back and forth I crawled underneath and I see that the front driveshaft turns a considerable amount vs the rear, almost 180 degrees before stopping and causing the clank. It’s like there’s tons of backlash in the front diff, anyone else experience this? Trying to figure out if it’s a diff issue or transfer case issue but it’s looking like the diff. With the amount of play it has I’d swear it’s missing a tooth or something.
 

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