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M20/21 1st Gear
Description
This 1st gear is designed for Muncie M20 and M21 4-speed manual transmissions. Made from carburized alloy steel (SCM415 or SAE 8620) with a helical tooth profile and integrated baulkring teeth, it ensures smooth low-speed torque delivery and reliable gear engagement. Ideal for classic GM muscle car restorations or replacements.
Specification
Gear Type: Helical Gear
Tooth Count: 36 teeth
Material: Carburized alloy steel (SCM415, SAE 8620)
Heat Treatment: Carburized and quenched
Surface Hardness: HRC 58–62
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Model：WT297-12A, 3884685
.webp "T10A-16(S-568)")
.webp "T10Y-8B(S-917)")
