USA Standard Gear ZMZF1319-203-024 ZF S6-650 6-Speed Manual Transmission Countershaft Assembly

The USA Standard Gear ZMZF1319-203-024 is a replacement countershaft assembly engineered for the ZF S6-650 6-speed manual transmission. This precision-machined cluster shaft features a gear tooth count configuration of 39-35-25-19-12 and is designed to meet or exceed original equipment specifications for reliable drivetrain performance.

USA Standard Gear manufactures this countershaft assembly as a direct OEM replacement, ensuring proper gear mesh, smooth shifting, and long service life. The ZF S6-650 is a heavy-duty manual transmission commonly found in diesel truck applications, and this countershaft is a critical internal component that must be replaced when worn or damaged to restore proper transmission function.

Key Features:

• Direct OEM Replacement — engineered to match original ZF S6-650 specifications
• Gear Configuration: 39-35-25-19-12 tooth countershaft cluster
• Application: ZF S6-650 6-speed manual transmission (7.3L Diesel)
• Precision machined for consistent gear mesh and smooth operation
• OEM Cross-Reference: ZF Part No. 1319-203-024
• Built to USA Standard Gear's better-than-OEM drivetrain standards

This countershaft assembly is an essential internal transmission component. Proper installation by a qualified transmission technician is recommended. Cross-references ZF OEM part number 1319-203-024.