GEN 1 2014 Raptor R680 transmission is making a winding/sucking noise when put into gear to drive

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Friedraptor

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The truck has 92,400 miles on it. Transmission has a deep tranny pan with a CBR cooler and a thermal bypass valve installed. ( which just removes the thermostat in the tranny so the fluid always flows through the cooler before reaching the 190 degrees)
When I put the truck into gear and drive it begins to make a weird whining/ sucking grinding sound. But seems to
Shift and drive just fine. Any idea what it could be?
 
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