LOUD HUMMING OVER 45

als crafter

New member
I have a 2020 crafter on 220k and it has a loud humming noise over 45mph only when you touch the accelerator even slightly. the garage changed a rear bearing and new diff oil but its still the same. does anyone know if it will be the diff and if it can be fixed or replaced ?.
I have half converted the van and spent too much to start again but its unbearable to drive.
any help and info would be appreciated.
cheers, AL
 
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