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Oscillating chirp noise

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So driving home, I was in 4wd from our recent snowfall. Half way home suddenly I start hearing a chirp noise. It's oscillating as well. It Will make the noise going down hill but mostly When under load.

If I take it out of 4wd, it Will fade away... What is it? Can I still use my 4wd?

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I have a CAD. I didn't realize the front shaft had a slip yoke. Anyone know what u joint is most likely to go out in the front? Having trouble narrowing it down to what type I have in the shafts in the front. The local parts store wasn't very helpful.

Is the double cardan unit hard to pull apart if they are the culprit?

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I've removed it, but never replaced them.  I found I had to remove the front yoke, then maneuver the shaft around with a jackstand to get access to the bolts holding the cardan onto the transfer case.  

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I would call the stealership and get their part#'s for them and then cross check to order from another retailer. Replace all there are. If your going through the effort to replace one it only takes 10 min to do another.

Edited by eddielee

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