Make sure this part fits

GM 12491878 Transmission Asm,Auto 4Tvd (Goodwrench Remanufacture)

2004 GM

Customer Questions & Expert Answers (3)
12491878 GM Transmission Asm,Auto 4Tvd (Goodwrench Remanufacture) Illustration 1 of 1
  • Part Description
    TRANSMISSION, Manual(5 Speed)
  • Manufacturer
    General Motors
  • Manufacturer's Notes
    This part is discontinued.
Make sure this part fits
  • Specifications
  • Fitment
  • Q&A
  • Product Specifications

    BrandGenuine GM
    Manufacturer Part Number12491878
    Part DescriptionTRANSMISSION, Manual(5 Speed)
    Other NamesTransmission
    Item Dimensions46.7 x 22.8 x 24.9 inches
    Item Weight124.60 Pounds
    ConditionRemanufactured
    Fitment TypeDirect Replacement
    ManufacturerGeneral Motors
    SKU12491878
    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 Chevrolet Colorado4 Cyl 2.8LCREW CAB, EXTENDED CAB, EXTENDED LENGTH, PICKUP
    2004 GMC Canyon4 Cyl 2.8LPICKUP, PICKUP CREW CAB, PICKUP EXTENDED CAB, PICKUP EXTENDED LENGTH
  • 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 12491878 fits your vehicle.
    Posted and answered by GM Parts Specialist Julian
    Q:
    What should be done if the Transmission Assembly will be disassembled for the 2004 GMC Canyon? Posted by Joan P.
    A:
    Drain the lubricant from the transmission. You can Select Your Vehicle to see complete installation and repair tips.
    Answered by GM Parts Specialist Henry / Jan 03, 2026
    Q:
    How should you prepare to remove the Transmission Assembly from the engine for the 2004 Chevrolet Colorado? Posted by Horseless C.
    A:
    Support the engine from above with an engine hoist or jack, and support the transmission with a jack. Remove the nuts securing the transmission mount and unbolt the crossmember. Lower the engine and transmission to reach the top and sides of the transmission. You can Select Your Vehicle to see complete installation and repair tips.
    Answered by GM Parts Specialist Jose / Dec 11, 2023

Genuine GM Part 12491878, the Right Choice

To ensure reliability, purchase GM part # 12491878 Transmission Asm,Auto 4Tvd (Goodwrench Remanufacture). It is sometimes referred to as GM Transmission Assembly. 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. It fits GMC Canyon.

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