The SYN-650-1SC ZF-S6-650 Carbon Synchro 1st or 2nd is a carbon-lined 1st-gear synchro from Synchrotech, engineered for Chevy, Ford, GMC transmissions. Carbon friction material grips faster and wears longer than factory brass, delivering smoother, more consistent shifts under hard use — on the street, strip, or track.

Why upgrade to carbon synchros:

• Faster, smoother engagement and reduced grind
• Superior heat and wear resistance vs. OEM brass
• Ideal for high-horsepower, high-RPM and track use
• Direct-fit replacement — no transmission modification required

Backed by Synchrotech quality and shipped fast from Speedzone Performance.