G2 1-2021-373 3.73 ratio ring and pinion; GM 10-bolt 8.5", 8.6&quot

$287.99 (updated March 18, 2020, 3:49 pm)

Designed for High Performance Applications
Forged from High Strength 8620 Steel
Heat Treated for Long Service Life

Usually ships in 1-2 business days

SKU: g2-1-2021-373 Category:


G2 Axle & Gear G/21-2021-373 OEM 3.73 ring and pinion gear set for GM 10-bolt 8.5″ and 8.6″ axles. G2 OEM series gears have been engineered and manufactured to the exact specs of the original equipment manufacturer (OEM) to provide the quietest, coolest running gears possible while maintaining strength and ease of installation. All of the stringent quality standards present in modern automobile manufacturers are met in our G2 OEM ring and pinion gear sets because they’re made under contract by the original equipment manufacturers. There’s no questioning their integrity.

G2 OEM series gears (G/21-2021-373) feature:

  • 10 Year Warranty
  • Computer Heat Treated 8620 Steel
  • Manufactured To O.E. Specs
  • Double Shot Peened
  • Double Lapped

For use on GM 10-bolt 8.5″ and 8.6″ axles.

Master installation kit part # g2-35-2022 is required for 8.6″ axles.

What is the difference between GM 10-bolt 8.5″ and 8.6″ axles?


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