Sherman Over/Under Drive

Just recently bough a Ford 8N with a Sherman Over/Under Drive. When the sherman is engaged in overdrive it does drive faster but there seems to be a humming/whining noise. When Sherman is in just regular standard - there is no noise.

Is it common for the sherman to make some humming/whining noise? Or is there something wrong with mine?
 
tractormuellerp ,Yes it is common for it to wine more in hidh range than in direct.As the transmission gears are spinning faster.
 

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