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TREMEC S650
Description
Direct-replacement 3rd gear (mainshaft) for the ZF S6-650 6-speed manual, commonly used on Ford Super Duty trucks. The helical gear (27T) with an integrated 48-tooth synchronizer dog ring is precision-hobbed and finish-ground to OE geometry for smoother 2–3/3–4 shifts, reduced gear whine, and reliable engagement under load. Drop-in fit for rebuilds.
Specification
Tooth Form : Helical
Tooth Count : 48/27T
Material: Alloy case-hardening steel, SCM415 / SAE 8620 (or equivalent)
Heat Treatment: Carburized & quenched
Surface Hardness: HRC 58–62
Manufacturing: CNC turning/milling; precision hobbing; dog-tooth finishing & deburring; bore and locating faces precision-ground
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Model：ZFS6-11
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