5th Gear Pair (31T / 39T)

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5th Gear Pair 31T 39T

Description

Replacement 5th gear pair engineered for the F20 5-speed transmission, used on Alfa Romeo, Peugeot Bipper, and Fiat Doblo (verify gearbox code and model year). Precision helical gears with case-hardening deliver high load capacity, low wear, and smooth, quiet cruising. Built to OE geometry for true drop-in service.

Specification

Tooth Form: Helical

Tooth Count: 31T / 39T

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, dog-tooth finishing & deburring; bore & faces precision-ground