Make sure this part fits

Hummer 17803774 Transmission

2008 Hummer H3

Customer Questions & Expert Answers (3)
17803774 GM Transmission Illustration 1 of 1
  • Part Description
    Transmission, Auto
  • Replaces
    12491398
  • Manufacturer
    General Motors
Make sure this part fits
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  • Specifications
  • Fitment
  • Q&A
  • Product Specifications

    BrandGenuine Hummer
    Manufacturer Part Number17803774
    Part DescriptionTransmission; Transmission, Auto
    Item Dimensions47.6 x 23.0 x 24.1 inches
    Item Weight228.80 Pounds
    ConditionNew
    Fitment TypeDirect Replacement
    Replaces12491398
    ManufacturerGeneral Motors
    SKU17803774
    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
    2008 Hummer H35 Cyl 3.7LSUV
  • 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 17803774 fits your vehicle.
    Posted and answered by GM Parts Specialist Julian
    Q:
    What are the initial steps to prepare for Transmission Assembly removal for the 2008 Chevrolet Colorado? Posted by Collin O.
    A:
    Start by disconnecting the cable from the negative terminal of the battery. Then, raise the vehicle and support it securely on jackstands. If necessary, remove the skid plate and skid plate crossmember. You can Select Your Vehicle to see complete installation and repair tips.
    Answered by GM Parts Specialist Bob / Feb 15, 2026
    Q:
    What additional components need to be removed if the Transmission Assembly is equipped for the 2008 GMC Canyon? Posted by Yuri B.
    A:
    If equipped, remove the skid plate and disconnect the electrical connectors from the transmission and the oxygen sensor connectors. You can Select Your Vehicle to see complete installation and repair tips.
    Answered by GM Parts Specialist Jeremy / Sep 29, 2025

Genuine GM Part 17803774, the Right Choice

To ensure reliability, purchase GM part # 17803774 Transmission. It is sometimes referred to as Hummer 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 Hummer H3 models.

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