Wow, that's an odd one. Never had that with any of my 722.3's. If you buy it and fix the issue, let me know how it goes. Just a shot in the dark, what's the fluid level? Overfilled, underfilled?

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k