Earlier this summer I had my gears switched from 3.73 to 3.55 in my roadster with a coyote gen3 and TKO 500 transmission. When I ever I take my foot of the gas pedal the engine/transmission or axle makes a whining sound. Once you touch the gas pedal in the slightest way it goes away. I assume it is the load being taken off the transmission or axle? Do I need to add another shim or is it some other problem. As far as I can tell the car shifts perfectly besides the whine. Also, the car makes the same noise if in neutral when coasting to a stop.

Thanks
Craig