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The Goodman B1376857 is a genuine OEM blower motor mount arm (motor leg/bracket) for the ACVC960603BNAA variable-speed gas furnace. It is one of the support arms that cradle the blower motor inside the belly band assembly, holding the motor concentric within the blower housing so the wheel spins true and vibration stays low. A bent, corroded, or missing mount arm causes blower noise, wobble, and premature bearing wear.
OEM vs. Generic: Motor mount arms are model-specific in length and bolt-hole spacing. The OEM B1376857 matches the factory belly band and motor frame exactly, preserving correct motor alignment. Universal arms often require drilling and can leave the motor off-center.
Install Difficulty: Moderate (3/5). Requires removing the blower assembly and loosening the belly band; a nut driver and basic hand tools are needed. For best results, replace all three arms as a set if the others show wear. Disconnect power before servicing.
Match the OEM number B1376857 to your furnace's blower parts breakdown to confirm fit.