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The Goodman B1376857 motor mount arm is a genuine OEM support bracket that secures the blower motor within the ADVC81005CXBA furnace assembly. Working with the motor's belly-band, these mount arms hold the motor in precise alignment with the blower housing and isolate vibration for quiet operation. Cracked, bent, or corroded mount arms cause rattling, blower-wheel rub, and premature bearing wear — replacing them restores solid, resonance-free mounting.
Motor mounting is dimensionally critical. The OEM B1376857 matches the factory bolt pattern, arm length, and grommet spacing exactly, so the blower stays centered in its housing. Universal or fabricated brackets often force minor misalignment that leads to noise and vibration. For a component that determines motor alignment, OEM is the reliable choice.
Moderate (3/5). Plan on 30–45 minutes since the blower assembly usually must be partially withdrawn to access the mount arms. Cut power at the disconnect first. Support the motor, transfer one arm at a time to maintain alignment, and torque evenly. Larger jobs are best handled by an HVAC technician.