TREMEC S650 Synchronizer Ring
Description
Direct-replacement blocker/synchronizer ring for ZF S6-650 6-speed manuals, commonly used in Ford Super Duty and other heavy-duty applications. Precision-finished dog teeth and a true, uniform cone surface deliver cleaner, more consistent shifts with reduced notchiness and grind. Built from surface-hardened alloy steel for durability, with ground faces to maintain alignment under load. OE-matched geometry allows a straightforward drop-in during rebuilds—pair with the correct hub, sleeve, keys/springs, and verify the intended gear set before ordering.
Specification
Tooth Count : 48 / 60 teeth
Material: Medium-carbon steel, S45C
Heat Treatment: Surface hardening & tempering
Surface Hardness: HRC 58–62
Manufacturing Processes: CNC turning/milling; dog-tooth finishing & deburring; end and locating faces precision-ground
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Model:ZF650-80 (S-589)