SG-B078-GS5 — 5th Gear Set (Pro Series, 0.787 Ratio, GSR)

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SG-B078-GS5 — 5th Gear Set Pro Series 0.787 Ratio GSR

Description

The SG-B078-GS5 is a Pro Series 0.787:1 overdrive 5th-gear pair engineered for GSR/B18C-family B-series gearboxes. Supplied as matched mainshaft and countershaft gears, the precision-hobbed helical profile with edge relief and ground bore/faces ensures quiet, rigid mesh and smooth 4→5 / 5→4 shifts. Built to OE-level tolerances for a true drop-in; best paired with the 5/R synchronizer assembly.

Specification

Tooth Form: Helical

Material: SCM415 / SAE 8620 alloy case-hardening steel (or equivalent)

Heat Treatment: Carburized & quenched

Surface Hardness: HRC 58–62

Manufacturing: CNC turning/milling; precision hobbing; deburring/edge-relief; bore & locating faces precision-ground