Is the rumble above 40? If not its not a wheel bearing, they make a horrible howling above 40 (think WWII Bomber drone)

Replace all the vacuum line and tubing from the SAP to the back of the intake manifold, and the 2 vacuum caps back there, as well as the 2 short sections of hose between the check valve on the back as well - I also replaced both pieces that come off the "L" fitting on the lower intake elbow recently, lower intake elbow itself was replaced a couple years ago.

If you still have a vacuum leak after all that, I'd be shocked.

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2018 Ram 2500 6.7L Cummins 68RFE
19k miles -Bright White/Black - Big Horn Sport - Crew Cab Short Bed
2013 X5 35D (CEO's) - Born on 5/17/2013 -
82k miles - Alpine White/Cinnamon Brown/Premium Pkg, Sport Activity/Premium Pkg and Sound/20" Style 214/Running Boards