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03 Sierra AWD blew 2 transfer cases

Bigfutz
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Bigfutz

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Blew 2 Transfer Cases, Shop Says Yoke is Bad

I need help understanding what the transmission shop is telling me on my 2003 GMC Sierra Denali QS AWD. Long story short, blew out the rear drive seal and bearing on my transfer case. Replaced it DIY with a reman. 3 months later, it happened again. The transmission shop is saying the yoke is bad, causing it to walk out. $3300 to repair. I didn’t see anything abnormal with the yoke - i mean the bearings felt fine and there was no obvious damage. Aluminum drive shaft looks fine. Can someone explain if this sounds right and how to determine a bad yoke? I just don’t want to dump money into getting it repaired and then some other issue turns up to be the cause. 

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