Free Shipping On Orders Over $75. Details

Talk to a Sierra Enthusiast
M-F 8:30A-11P, Sat-Sun 8:30A-9P
Win $5,000 For Your Sierra !! Enter daily!

Yukon Gear 8.5 in. & 8.6 in. Rear Axle Ring Gear and Pinion Kit - 3.73 Gears (07-18 Sierra 1500)

Market Price $337.80 You Save 12% ($38.86)
Our Price


FREE Shipping

  • Item S500846

Will this fit your Truck?

Change Vehicle Help?
In Stock Ships same business day.
Ship to: Ashburn - 20149
Sorry, please enter a valid US or CA postal code
We're sorry, zip can't be updated at this time.
    Create a list
    Add to New List

    Saved - View your saved items

    We're sorry. We couldn't save this product at this time.

    Features & Details

    • Ring and Pinion Gear Set
    • Fits GM 8.5" & 8.6" differentials
    • 3.73 Ratio
    • 8.5" Ring Gear
    • 30 Spline Pinion
    • 8620 Triple Alloy Steel
    • Includes 1 year warranty
    • Fits 2007-2018 GMC Sierras
    Street and Towing Gear. Switching to a lower gear ratio will increase acceleration, improve off-road performance and facilitate towing on your 2007-2018 Sierra pickup. This Yukon Gear Ring and Pinion has a gear ratio of 3.73:1, meaning the driveshaft spins 3.73 times for every revolution of the wheels. A 3.73 gear is a good upgrade for Sierras that came stock with a 3.08 ratio. 3.73's will provide more grunt down low that is useful for overcoming small trail obstacles or pulling a trailer, yet is still not too low that city driving will be aversely affected. A 3.73 ratio is ideal for pickups that do split duty between street, towing and trail driving and are still using stock or close to stock sized tires.

    Premium 8620 Steel. Yukon Gear builds their ring and pinion sets from premium 8620 triple alloy steel, an extremely high strength, durable steel that is significantly more durable than stock. The helical cut teeth provide smooth, noise free engagement.

    Professional Installation Recommended. Due to the complexity involved with installing a new pinion and ring gear, it is recommended that the job be done by a drivetrain specialist.

    Application. This Yukon Gear 3.73 Ring and Pinion Gear Set is specifically designed for all 2007-2018 GMC Sierras equipped with an 8.5" or 8.6" rear differential.

    Fitment: 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 Details

    MPN# YG GM8.5-373

    CA Residents: WARNING: Cancer and Reproductive Harm -

    What's in the Box
    • (1) Ring Gear
    • (1) Pinion Gear
    Installation Info

      Customer Photos

        Questions & Answers (1)

        1 Top Rated Question

        How much towing power will I gain by changing from the 3.42 gear to the 3.73 gear?

        • Changing gear ration does not change your power, it simply allows for the ability to reach the top end of each gear faster, which typically means your driving faster. This is a mechanical change however, so this will not be changing any HP or TQ numbers.

        Helpful (0)
        Post Your Question


          Related Sierra 1500 Categories