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  • USA Standard Gear Manual Transmission ZF 2nd Gear 6-Speed 31-Tooth ZMZFS6-21 fits 1999-2001 Ford F-250 Super Duty / 1999-2000 Ford F-350 Super Duty / 1999 Ford F-450 Super Duty / 2001 Ford F-550 Super Duty
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USA Standard Gear Manual Transmission ZF 2nd Gear 6-Speed 31-Tooth ZMZFS6-21 fits 1999-2001 Ford F-250 Super Duty / 1999-2000 Ford F-350 Super Duty / 1999 Ford F-450 Super Duty / 2001 Ford F-550 Super Duty
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Load image into Gallery viewer, USA Standard Gear Manual Transmission ZF 2nd Gear 6-Speed 31-Tooth ZMZFS6-21 fits 1999-2001 Ford F-250 Super Duty / 1999-2000 Ford F-350 Super Duty / 1999 Ford F-450 Super Duty / 2001 Ford F-550 Super Duty

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USA Standard Gear Manual Transmission ZF 2nd Gear 6-Speed 31-Tooth ZMZFS6-21 fits 1999-2001 Ford F-250 Super Duty / 1999-2000 Ford F-350 Super Duty / 1999 Ford F-450 Super Duty / 2001 Ford F-550 Super Duty

⚠️ Please verify fitment before purchasing. Check the fitment chart below or use the Year/Make/Model tool to confirm this part fits your vehicle.

⚠️ Verify fitment before purchasing. Check the fitment chart below or click the 3 lines in the top left menu, select Home, then use the Year/Make/Model guide.

USA Standard Gear
ZMZFS6-21
Out of stock
$194.99 USD
USA Standard Gear Manual Transmission ZF 2nd Gear 6-Speed 31-Tooth ZMZFS6-21 fits 1999-2001 Ford F-250 Super Duty / 1999-2000 Ford F-350 Super Duty / 1999 Ford F-450 Super Duty / 2001 Ford F-550 Super Duty
Description
USA Standard Gear manufactures a full line of top-quality transmission parts. You can count on USA Standard Gear to fulfill all your transmission, differential, and general replacement part needs.


Specifications:

Description_SHO Manual Trans Parts
Description_INV ZMZFS6-21
Description_KEY ,1319-204-013,2ND,31,6SPD,GEAR,M/T,TOOTH,ZF,ZF6-21,ZFGEAR2,ZFS6-21,ZMZF,
Description_DES USA standard Manual Transmission ZF 2nd Gear 6-SPD 31-Tooth
Description_ASM ZF 6SPD M/T 2ND GEAR '99-'02, 31 TOOTH
Description_EXT ZF M/T 2ND GEAR 6SPD , 31 TOOTH .
Description_MKT USA Standard Gear manufactures a full line of top-quality transmission parts. You can count on USA Standard Gear to fulfill all your transmission, differential, and general replacement part needs.
Description_FAB 2nd Gear 6-SPD
Description_FAB 31-Tooth
Description_FAB ZF Manual Transmission
Description_TLE USA Standard Manual Transmission ZF 2nd Gear 6-SPD 31-Tooth
Description_DEF Manual Transmission Gear

This Part Fits:

Year Make Model Submodel Engine
1999 Ford F-450 Super Duty XL Standard Cab Pickup 2-Door 6.8L 415Cu. In. V10 GAS SOHC Naturally Aspirated
1999-2000 Ford F-250 Super Duty Lariat Standard Cab Pickup 2-Door 6.8L 415Cu. In. V10 GAS SOHC Naturally Aspirated
1999-2000 Ford F-250 Super Duty Lariat Standard Cab Pickup 2-Door 7.3L 445Cu. In. V8 DIESEL OHV Turbocharged
1999-2000 Ford F-250 Super Duty Lariat Standard Cab Pickup 2-Door 5.4L 330Cu. In. V8 GAS SOHC Naturally Aspirated
1999-2000 Ford F-350 Super Duty Lariat Cab & Chassis 2-Door 6.8L 415Cu. In. V10 GAS SOHC Naturally Aspirated
1999-2000 Ford F-350 Super Duty Lariat Cab & Chassis 2-Door 5.4L 330Cu. In. V8 GAS SOHC Naturally Aspirated
1999-2000 Ford F-350 Super Duty Lariat Cab & Chassis 2-Door 7.3L 445Cu. In. V8 DIESEL OHV Turbocharged
1999-2000 Ford F-350 Super Duty Lariat Standard Cab Pickup 2-Door 6.8L 415Cu. In. V10 GAS SOHC Naturally Aspirated
1999-2000 Ford F-350 Super Duty Lariat Standard Cab Pickup 2-Door 5.4L 330Cu. In. V8 GAS SOHC Naturally Aspirated
1999-2000 Ford F-350 Super Duty Lariat Standard Cab Pickup 2-Door 7.3L 445Cu. In. V8 DIESEL OHV Turbocharged
1999-2001 Ford F-250 Super Duty Lariat Crew Cab Pickup 4-Door 7.3L 445Cu. In. V8 DIESEL OHV Turbocharged
1999-2001 Ford F-250 Super Duty Lariat Crew Cab Pickup 4-Door 6.8L 415Cu. In. V10 GAS SOHC Naturally Aspirated
1999-2001 Ford F-250 Super Duty Lariat Crew Cab Pickup 4-Door 5.4L 330Cu. In. V8 GAS SOHC Naturally Aspirated
1999-2001 Ford F-250 Super Duty Lariat Extended Cab Pickup 4-Door 7.3L 445Cu. In. V8 DIESEL OHV Turbocharged
1999-2001 Ford F-250 Super Duty Lariat Extended Cab Pickup 4-Door 5.4L 330Cu. In. V8 GAS SOHC Naturally Aspirated
1999-2001 Ford F-250 Super Duty Lariat Extended Cab Pickup 4-Door 6.8L 415Cu. In. V10 GAS SOHC Naturally Aspirated
1999-2001 Ford F-250 Super Duty XL Crew Cab Pickup 4-Door 5.4L 330Cu. In. V8 GAS SOHC Naturally Aspirated
1999-2001 Ford F-250 Super Duty XL Crew Cab Pickup 4-Door 6.8L 415Cu. In. V10 GAS SOHC Naturally Aspirated
1999-2001 Ford F-250 Super Duty XL Crew Cab Pickup 4-Door 7.3L 445Cu. In. V8 DIESEL OHV Turbocharged
1999-2001 Ford F-250 Super Duty XL Extended Cab Pickup 4-Door 6.8L 415Cu. In. V10 GAS SOHC Naturally Aspirated
1999-2001 Ford F-250 Super Duty XL Extended Cab Pickup 4-Door 5.4L 330Cu. In. V8 GAS SOHC Naturally Aspirated
1999-2001 Ford F-250 Super Duty XL Extended Cab Pickup 4-Door 7.3L 445Cu. In. V8 DIESEL OHV Turbocharged
1999-2001 Ford F-250 Super Duty XL Standard Cab Pickup 2-Door 5.4L 330Cu. In. V8 GAS SOHC Naturally Aspirated
1999-2001 Ford F-250 Super Duty XL Standard Cab Pickup 2-Door 7.3L 445Cu. In. V8 DIESEL OHV Turbocharged
1999-2001 Ford F-250 Super Duty XL Standard Cab Pickup 2-Door 6.8L 415Cu. In. V10 GAS SOHC Naturally Aspirated
1999-2001 Ford F-250 Super Duty XLT Crew Cab Pickup 4-Door 5.4L 330Cu. In. V8 GAS SOHC Naturally Aspirated
1999-2001 Ford F-250 Super Duty XLT Crew Cab Pickup 4-Door 6.8L 415Cu. In. V10 GAS SOHC Naturally Aspirated
1999-2001 Ford F-250 Super Duty XLT Crew Cab Pickup 4-Door 7.3L 445Cu. In. V8 DIESEL OHV Turbocharged
1999-2001 Ford F-250 Super Duty XLT Extended Cab Pickup 4-Door 5.4L 330Cu. In. V8 GAS SOHC Naturally Aspirated
1999-2001 Ford F-250 Super Duty XLT Extended Cab Pickup 4-Door 7.3L 445Cu. In. V8 DIESEL OHV Turbocharged
1999-2001 Ford F-250 Super Duty XLT Extended Cab Pickup 4-Door 6.8L 415Cu. In. V10 GAS SOHC Naturally Aspirated
1999-2001 Ford F-250 Super Duty XLT Standard Cab Pickup 2-Door 5.4L 330Cu. In. V8 GAS SOHC Naturally Aspirated
1999-2001 Ford F-250 Super Duty XLT Standard Cab Pickup 2-Door 6.8L 415Cu. In. V10 GAS SOHC Naturally Aspirated
1999-2001 Ford F-250 Super Duty XLT Standard Cab Pickup 2-Door 7.3L 445Cu. In. V8 DIESEL OHV Turbocharged
1999-2001 Ford F-350 Super Duty Lariat Cab & Chassis 4-Door 5.4L 330Cu. In. V8 GAS SOHC Naturally Aspirated
1999-2001 Ford F-350 Super Duty Lariat Cab & Chassis 4-Door 7.3L 445Cu. In. V8 DIESEL OHV Turbocharged
1999-2001 Ford F-350 Super Duty Lariat Cab & Chassis 4-Door 6.8L 415Cu. In. V10 GAS SOHC Naturally Aspirated
1999-2001 Ford F-350 Super Duty Lariat Crew Cab Pickup 4-Door 7.3L 445Cu. In. V8 DIESEL OHV Turbocharged
1999-2001 Ford F-350 Super Duty Lariat Crew Cab Pickup 4-Door 6.8L 415Cu. In. V10 GAS SOHC Naturally Aspirated
1999-2001 Ford F-350 Super Duty Lariat Crew Cab Pickup 4-Door 5.4L 330Cu. In. V8 GAS SOHC Naturally Aspirated
1999-2001 Ford F-350 Super Duty Lariat Extended Cab Pickup 4-Door 7.3L 445Cu. In. V8 DIESEL OHV Turbocharged
1999-2001 Ford F-350 Super Duty Lariat Extended Cab Pickup 4-Door 6.8L 415Cu. In. V10 GAS SOHC Naturally Aspirated
1999-2001 Ford F-350 Super Duty Lariat Extended Cab Pickup 4-Door 5.4L 330Cu. In. V8 GAS SOHC Naturally Aspirated
1999-2001 Ford F-350 Super Duty XL Cab & Chassis 2-Door 5.4L 330Cu. In. V8 GAS SOHC Naturally Aspirated
1999-2001 Ford F-350 Super Duty XL Cab & Chassis 2-Door 7.3L 445Cu. In. V8 DIESEL OHV Turbocharged
1999-2001 Ford F-350 Super Duty XL Cab & Chassis 2-Door 6.8L 415Cu. In. V10 GAS SOHC Naturally Aspirated
1999-2001 Ford F-350 Super Duty XL Cab & Chassis 4-Door 5.4L 330Cu. In. V8 GAS SOHC Naturally Aspirated
1999-2001 Ford F-350 Super Duty XL Cab & Chassis 4-Door 6.8L 415Cu. In. V10 GAS SOHC Naturally Aspirated
1999-2001 Ford F-350 Super Duty XL Cab & Chassis 4-Door 7.3L 445Cu. In. V8 DIESEL OHV Turbocharged
1999-2001 Ford F-350 Super Duty XL Crew Cab Pickup 4-Door 7.3L 445Cu. In. V8 DIESEL OHV Turbocharged
1999-2001 Ford F-350 Super Duty XL Crew Cab Pickup 4-Door 5.4L 330Cu. In. V8 GAS SOHC Naturally Aspirated
1999-2001 Ford F-350 Super Duty XL Crew Cab Pickup 4-Door 6.8L 415Cu. In. V10 GAS SOHC Naturally Aspirated
1999-2001 Ford F-350 Super Duty XL Extended Cab Pickup 4-Door 7.3L 445Cu. In. V8 DIESEL OHV Turbocharged
1999-2001 Ford F-350 Super Duty XL Extended Cab Pickup 4-Door 6.8L 415Cu. In. V10 GAS SOHC Naturally Aspirated
1999-2001 Ford F-350 Super Duty XL Extended Cab Pickup 4-Door 5.4L 330Cu. In. V8 GAS SOHC Naturally Aspirated
1999-2001 Ford F-350 Super Duty XL Standard Cab Pickup 2-Door 6.8L 415Cu. In. V10 GAS SOHC Naturally Aspirated
1999-2001 Ford F-350 Super Duty XL Standard Cab Pickup 2-Door 7.3L 445Cu. In. V8 DIESEL OHV Turbocharged
1999-2001 Ford F-350 Super Duty XL Standard Cab Pickup 2-Door 5.4L 330Cu. In. V8 GAS SOHC Naturally Aspirated
1999-2001 Ford F-350 Super Duty XLT Cab & Chassis 2-Door 5.4L 330Cu. In. V8 GAS SOHC Naturally Aspirated
1999-2001 Ford F-350 Super Duty XLT Cab & Chassis 2-Door 6.8L 415Cu. In. V10 GAS SOHC Naturally Aspirated
1999-2001 Ford F-350 Super Duty XLT Cab & Chassis 2-Door 7.3L 445Cu. In. V8 DIESEL OHV Turbocharged
1999-2001 Ford F-350 Super Duty XLT Cab & Chassis 4-Door 6.8L 415Cu. In. V10 GAS SOHC Naturally Aspirated
1999-2001 Ford F-350 Super Duty XLT Cab & Chassis 4-Door 5.4L 330Cu. In. V8 GAS SOHC Naturally Aspirated
1999-2001 Ford F-350 Super Duty XLT Cab & Chassis 4-Door 7.3L 445Cu. In. V8 DIESEL OHV Turbocharged
1999-2001 Ford F-350 Super Duty XLT Crew Cab Pickup 4-Door 6.8L 415Cu. In. V10 GAS SOHC Naturally Aspirated
1999-2001 Ford F-350 Super Duty XLT Crew Cab Pickup 4-Door 7.3L 445Cu. In. V8 DIESEL OHV Turbocharged
1999-2001 Ford F-350 Super Duty XLT Crew Cab Pickup 4-Door 5.4L 330Cu. In. V8 GAS SOHC Naturally Aspirated
1999-2001 Ford F-350 Super Duty XLT Extended Cab Pickup 4-Door 6.8L 415Cu. In. V10 GAS SOHC Naturally Aspirated
1999-2001 Ford F-350 Super Duty XLT Extended Cab Pickup 4-Door 7.3L 445Cu. In. V8 DIESEL OHV Turbocharged
1999-2001 Ford F-350 Super Duty XLT Extended Cab Pickup 4-Door 5.4L 330Cu. In. V8 GAS SOHC Naturally Aspirated
1999-2001 Ford F-350 Super Duty XLT Standard Cab Pickup 2-Door 6.8L 415Cu. In. V10 GAS SOHC Naturally Aspirated
1999-2001 Ford F-350 Super Duty XLT Standard Cab Pickup 2-Door 5.4L 330Cu. In. V8 GAS SOHC Naturally Aspirated
1999-2001 Ford F-350 Super Duty XLT Standard Cab Pickup 2-Door 7.3L 445Cu. In. V8 DIESEL OHV Turbocharged
1999-2001 Ford F-450 Super Duty Lariat Cab & Chassis - Conventional 2-Door 6.8L 415Cu. In. V10 GAS SOHC Naturally Aspirated
1999-2001 Ford F-450 Super Duty Lariat Cab & Chassis - Conventional 2-Door 7.3L 445Cu. In. V8 DIESEL OHV Turbocharged
1999-2001 Ford F-450 Super Duty Lariat Cab & Chassis - Crew Cab 4-Door 6.8L 415Cu. In. V10 GAS SOHC Naturally Aspirated
1999-2001 Ford F-450 Super Duty Lariat Cab & Chassis - Crew Cab 4-Door 7.3L 445Cu. In. V8 DIESEL OHV Turbocharged
1999-2001 Ford F-450 Super Duty XL Cab & Chassis - Conventional 2-Door 6.8L 415Cu. In. V10 GAS SOHC Naturally Aspirated
1999-2001 Ford F-450 Super Duty XL Cab & Chassis - Conventional 2-Door 7.3L 445Cu. In. V8 DIESEL OHV Turbocharged
1999-2001 Ford F-450 Super Duty XL Cab & Chassis - Crew Cab 4-Door 7.3L 445Cu. In. V8 DIESEL OHV Turbocharged
1999-2001 Ford F-450 Super Duty XL Cab & Chassis - Crew Cab 4-Door 6.8L 415Cu. In. V10 GAS SOHC Naturally Aspirated
1999-2001 Ford F-450 Super Duty XLT Cab & Chassis - Conventional 2-Door 7.3L 445Cu. In. V8 DIESEL OHV Turbocharged
1999-2001 Ford F-450 Super Duty XLT Cab & Chassis - Conventional 2-Door 6.8L 415Cu. In. V10 GAS SOHC Naturally Aspirated
1999-2001 Ford F-450 Super Duty XLT Cab & Chassis - Crew Cab 4-Door 7.3L 445Cu. In. V8 DIESEL OHV Turbocharged
1999-2001 Ford F-450 Super Duty XLT Cab & Chassis - Crew Cab 4-Door 6.8L 415Cu. In. V10 GAS SOHC Naturally Aspirated
1999-2001 Ford F-550 Super Duty Lariat Cab & Chassis - Conventional 2-Door 7.3L 445Cu. In. V8 DIESEL OHV Turbocharged
1999-2001 Ford F-550 Super Duty Lariat Cab & Chassis - Conventional 2-Door 6.8L 415Cu. In. V10 GAS SOHC Naturally Aspirated
1999-2001 Ford F-550 Super Duty Lariat Cab & Chassis - Crew Cab 4-Door 6.8L 415Cu. In. V10 GAS SOHC Naturally Aspirated
1999-2001 Ford F-550 Super Duty Lariat Cab & Chassis - Crew Cab 4-Door 7.3L 445Cu. In. V8 DIESEL OHV Turbocharged
1999-2001 Ford F-550 Super Duty XL Cab & Chassis - Conventional 2-Door 6.8L 415Cu. In. V10 GAS SOHC Naturally Aspirated
1999-2001 Ford F-550 Super Duty XL Cab & Chassis - Conventional 2-Door 7.3L 445Cu. In. V8 DIESEL OHV Turbocharged
1999-2001 Ford F-550 Super Duty XL Cab & Chassis - Crew Cab 4-Door 7.3L 445Cu. In. V8 DIESEL OHV Turbocharged
1999-2001 Ford F-550 Super Duty XL Cab & Chassis - Crew Cab 4-Door 6.8L 415Cu. In. V10 GAS SOHC Naturally Aspirated
1999-2001 Ford F-550 Super Duty XLT Cab & Chassis - Conventional 2-Door 6.8L 415Cu. In. V10 GAS SOHC Naturally Aspirated
1999-2001 Ford F-550 Super Duty XLT Cab & Chassis - Conventional 2-Door 7.3L 445Cu. In. V8 DIESEL OHV Turbocharged
1999-2001 Ford F-550 Super Duty XLT Cab & Chassis - Crew Cab 4-Door 6.8L 415Cu. In. V10 GAS SOHC Naturally Aspirated
1999-2001 Ford F-550 Super Duty XLT Cab & Chassis - Crew Cab 4-Door 7.3L 445Cu. In. V8 DIESEL OHV Turbocharged
2001 Ford F-550 Super Duty Base Cab & Chassis - Conventional 2-Door 6.8L 415Cu. In. V10 GAS SOHC Naturally Aspirated
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