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Out of curiosity, when was the last time you flushed it and what kind of fluid did you use?

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I've had this clunk going on in mine when stopping and pulling out. Ive recently replaced the trans mount when doing transgo jr and pump rub kit. I've pulled and greased the rear drive shaft splines with red mobil1 grease. Could this be related?
2500HD ECSB 4X4.

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Put everything back together today. I could tell in the first 10ft that the shudder and clunk are GONE.


Maybe the u joints are my issue after all... 134k miles isn't high for them from what I've read but I suppose not terrible. It looks like you got the acDelco ones with the zero fittings. That's the route I plan on going too so i can grease them when indo my front end.

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I may be wrong but I think he was talking about the front of the drive shaft u joint

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