Make sure this part fits

GM 12479021 Front/Rear Differential and Planet CASE

2002-2012 GM

Customer Questions & Expert Answers (3)
12479021 GM Front/Rear Differential and Planet CASE Product Photo 1 of 3
  • Part Description
    Case, Front/Rear Differential And Planet
  • Position
    Front and Rear
  • Manufacturer
    General Motors
  • Manufacturer's Notes
    This part is discontinued.
Make sure this part fits
  • Related Parts
  • Specifications
  • Fitment
  • Q&A
  • Product Specifications

    BrandGenuine GM
    Manufacturer Part Number12479021
    Part DescriptionCase, Front/Rear Differential And Planet
    Other NamesDifferential Case
    Item Dimensions10.4 x 8.9 x 8.7 inches
    Item Weight13.30 Pounds
    PositionFront and Rear
    ConditionNew
    Fitment TypeDirect Replacement
    ManufacturerGeneral Motors
    SKU12479021
    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
    2004-2007 Buick Rainier6 Cyl 4.2L, 8 Cyl 5.3L4 DOOR
    2004-2012 Chevrolet Colorado4 Cyl 2.8L, 4 Cyl 2.9L, 5 Cyl 3.5L, 5 Cyl 3.7LCREW CAB, EXTENDED CAB, EXTENDED LENGTH, PICKUP
    2002-2009 Chevrolet Trailblazer6 Cyl 4.2L, 8 Cyl 5.3L4 DOOR
    2004-2012 GMC Canyon4 Cyl 2.8L, 4 Cyl 2.9L, 5 Cyl 3.5L, 5 Cyl 3.7LPICKUP, PICKUP CREW CAB, PICKUP EXTENDED CAB, PICKUP EXTENDED LENGTH
    2002-2009 GMC Envoy6 Cyl 4.2L, 8 Cyl 5.3L4 DOOR
    2002-2004 Oldsmobile Bravada6 Cyl 4.2L4 DOOR
  • Customer Questions & Expert Answers

    Q:
    I'm wondering if this is complete and correct part for my vehicle.
    A:
    You can Select Your Vehicle to check if 12479021 fits your vehicle.
    Posted and answered by GM Parts Specialist Julian
    Q:
    What is the first step in the process for the Differential in the 2004 Chevrolet Trailblazer? Posted by Darryl O.
    A:
    Disconnect the cable from the negative terminal of the battery. You can Select Your Vehicle to see complete installation and repair tips.
    Answered by GM Parts Specialist Jose / Apr 21, 2024
    Q:
    What should you do after tightening the lug nuts and checking the Differential for the 2008 GMC Canyon? Posted by Rady D.
    A:
    Refill the front differential with the proper lubricant. You can Select Your Vehicle to see complete installation and repair tips.
    Answered by GM Parts Specialist Fernando / Aug 26, 2025

Genuine GM Part 12479021, the Right Choice

To ensure reliability, purchase GM part # 12479021 Front/Rear Differential and Planet CASE. It is sometimes referred to as GM Differential. 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 Buick Rainier models. It fits Chevrolet Colorado, Trailblazer. It also fits GMC Canyon, Envoy. This also fits Oldsmobile Bravada.

GMPartsGiant.com is a leading supplier of genuine GM parts and accessories such as GM 12479021 Front/Rear Differential and Planet CASE. You're certainly in the right place if you're searching for the great cost-effective OEM GM parts. Look no further than our vast inventory of genuine GM parts offered at unbeatable online prices, all of which are backed by the manufacturer's warranty. Not to forget, our hassle-free return policy and quick delivery service ensure a smooth shopping experience for you. For detailed GMC parts information, click here.
Find low prices on genuine OE parts from GM dealerships with fast delivery and dedicated service at GMPartsGiant.com.