Chevy Part Number

3990160 - flat washer, (15/32 x 7/8 x 3/32)(transmission crossmember to frame)

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Chevy Part #3990160 – Flat Washer (15/32″ ID x 7/8″ OD x 3/32″ Thick) for Transmission Crossmember to Frame

The GM 3990160 flat washer is a precision-engineered component designed for securing the transmission crossmember to the frame on Chevrolet vehicles. With a 15/32-inch inner diameter (ID), 7/8-inch outer diameter (OD), and 3/32-inch thickness, this washer helps evenly distribute clamping force, preventing damage to mounting surfaces and ensuring a secure and stable connection. Constructed from hardened steel with a corrosion-resistant coating, it withstands vibration, torque stress, and environmental exposure. This washer meets OEM specifications, making it an ideal choice for restorations, maintenance, and performance applications.

Advanced Part Information

– GM Part Number: 3990160
– Inner Diameter (ID): 15/32 inch
– Outer Diameter (OD): 7/8 inch
– Thickness: 3/32 inch
– Fastener Type: Flat washer
– Application: Transmission crossmember to frame
– Material: Hardened steel with corrosion-resistant coating
– Compatibility: Chevrolet Impala, Caprice (various years)
– OEM Equivalent: Direct factory replacement
– Function: Distributes load evenly to prevent surface damage and ensures secure fastening
– Installation: Works with factory bolts and nuts; ensure proper torque for optimal performance











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