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Chevrolet 20777021 Rear Axle Assembly (3.73 Ratio)

2009-2012 Chevrolet Colorado

Customer Questions & Expert Answers (3)
20777021 GM Rear Axle Assembly (3.73 Ratio) Illustration 1 of 1
  • Part Description
    Axle Assembly, Rear (3.73 Ratio)
  • Position
    Rear
  • Manufacturer
    General Motors
  • Manufacturer's Notes
    This part is discontinued.
Make sure this part fits
  • Specifications
  • Fitment
  • Q&A
  • Product Specifications

    BrandGenuine Chevrolet
    Manufacturer Part Number20777021
    Part DescriptionAxle Assembly, Rear (3.73 Ratio)
    Item Dimensions69.9 x 19.7 x 13.9 inches
    Item Weight84.90 Pounds
    PositionRear
    ConditionNew
    Fitment TypeDirect Replacement
    ManufacturerGeneral Motors
    SKU20777021
    WarrantyThis genuine GM part is guaranteed by GM's factory warranty.
    Shipping & ReturnShipping Policy Return Policy
    Warning: California's Proposition 65
  • Vehicle Fitment

    Year Make Model Engine Important vehicle option details
    2009-2012 Chevrolet Colorado8 Cyl 5.3LCREW CAB, EXTENDED CAB, EXTENDED LENGTH, PICKUP
  • Customer Questions & Expert Answers

    Q:
    I would like to confirm if this is the correct part number for my vehicle. Please advise. Thank you.
    A:
    You can Select Your Vehicle to check if 20777021 fits your vehicle.
    Posted and answered by GM Parts Specialist Henry
    Q:
    What is the next step after unbolting the brake hose retainer and removing the Axle Shaft for the 2012 GMC Canyon? Posted by Dimarian M.
    A:
    After unbolting the brake hose retainer, the next step is to remove the steering knuckle and simultaneously pull the driveaxle stub shaft out of the hub. You can Select Your Vehicle to see complete installation and repair tips.
    Answered by GM Parts Specialist Fernando / Feb 07, 2026
    Q:
    What does the differential in the rear axle assembly, including the Axle Shaft, allow for the 2009 GMC Canyon? Posted by Ned D.
    A:
    The differential allows the outer rear wheel to turn faster than the inner wheel when the vehicle goes around corners. You can Select Your Vehicle to see complete installation and repair tips.
    Answered by GM Parts Specialist Bob / May 14, 2026

Genuine GM Part 20777021, the Right Choice

To ensure reliability, purchase GM part # 20777021 Rear Axle Assembly (3.73 Ratio). It is sometimes referred to as Chevrolet Axle Shaft. Directly from GM, genuine parts are superb with regards to quality, longevity, and fit. Every single part passed stringent quality testing, so you can be sure that it's safe, durable, and built to perform like your original parts. This part fits specific Chevrolet Colorado models.

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