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What/where's the knuckle? Noticed the same noise on mine tonight. Took a ride on a creeper underneath while my wife idled up the driveway (yeah, I trust her;) and it's coming from where the driveshaft exits the transmission. The rubber boot is dry rotting and squeeking at low rpms........ Is this a failed seal and what does it take to replace?
That boot should just be a dust cover, unless its throwing oil all over your under side then I wouldn't worry, take a dab of grease and swipe it around in there if you can.
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