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Originally Posted by Discoandaboat
HOw do you tell when it is starting to go? Anyway to check it form under the vehicle?
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Unless it's obviously failing there is no way to really tell just by looking at it. You'll need to pull the drive shaft and rotate the joints by hand. They should move freely without hanging up or catching anywhere in thier motion. They should not feel rough in the travel, no grinding and no grittiness.
But if you have that drive shaft off let's just replace those u-joints!