Make sure this part fits

GM 12478060
Extension Housing Seal

1999-2007 GM

Customer Questions & Expert Answers (11)
GM 12478060 Extension Housing Seal
  • Part Description
    Seal, Transmission Extension; Manual Transmission Housing Seal; Gasket Set.
  • Position
    Rear
  • Replaces
    15635281
  • Manufacturer
    General Motors
  • Manufacturer's Notes
    This part is discontinued.
Make sure this part fits
  • Vehicle Fitment

    Year Make Model Trim Engine
    2002-2006, 1999-2000 Cadillac EscaladeBase8 Cyl 5.3 L GAS, 8 Cyl 5.7 L GAS, 8 Cyl 6.0 L GAS
    2002-2006 Chevrolet Avalanche 1500Base, LS, LT, On Road Edition, WBH, Z668 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS
    2002-2006 Chevrolet Avalanche 2500Base, LT8 Cyl 8.1 L GAS
    1999 Chevrolet C1500LS8 Cyl 5.0 L GAS, 8 Cyl 5.7 L GAS
    1999 Chevrolet C1500 SuburbanBase, LS, LT8 Cyl 5.7 L GAS, 8 Cyl 6.5 L DIESEL
    1999-2000 Chevrolet C2500Base, LS8 Cyl 5.0 L GAS, 8 Cyl 5.7 L CNG, 8 Cyl 5.7 L GAS, 8 Cyl 6.5 L DIESEL, 8 Cyl 7.4 L GAS
    1999 Chevrolet C2500 SuburbanBase, LS8 Cyl 5.7 L GAS, 8 Cyl 6.5 L DIESEL, 8 Cyl 7.4 L GAS
    1999-2000 Chevrolet C3500Base, LS8 Cyl 5.7 L CNG, 8 Cyl 5.7 L GAS, 8 Cyl 6.5 L DIESEL, 8 Cyl 7.4 L GAS
    1999 Chevrolet K1500LS8 Cyl 5.0 L GAS, 8 Cyl 5.7 L GAS
    1999 Chevrolet K1500 SuburbanBase, LS, LT8 Cyl 5.7 L GAS, 8 Cyl 6.5 L DIESEL
    View More
    Warning: California's Proposition 65
  • Customer Questions & Expert Answers

    Q:
    Is this 12478060 designed for my car? Posted by ChevyPartsGiant Specialist
    A:
    Please Select Your Vehicle model to see if part number 12478060 is suitable before ordering.
    Posted by ChevyPartsGiant Specialist
    Q:
    What should be checked after reinstalling the rear propeller shaft for the 2000 Cadillac Escalade? Posted by Customer
    A:
    Check the transfer case oil level and add oil as necessary.
    Posted by ChevyPartsGiant Specialist
    See expert answers on similar Transfer Case Seal
    Q:
    What should you ensure when installing the new input shaft seal for the 2003 Cadillac Escalade? Posted by Customer
    A:
    Ensure that the part numbers on the seal are facing outward, away from the body of the transfer case.
    Posted by ChevyPartsGiant Specialist
    See expert answers on similar Transfer Case Seal
    Q:
    What are the steps for installing a new output shaft bushing for the 2003 Chevrolet Avalanche 1500? Posted by Customer
    A:
    Use the J45380 to install a new output shaft bushing by installing the bushing or the finger section, attaching the finger section to the main body of the J45380, positioning the bushing and tool to the case, and using a hammer with the J45380 to install the bushing, ensuring the drain hole on the boot of the rear output shaft seal faces down toward the ground.
    Posted by ChevyPartsGiant Specialist
    See expert answers on similar Transfer Case Seal
    Q:
    How do you remove the rear output shaft bushing if necessary for the 2006 Chevrolet Avalanche 2500? Posted by Customer
    A:
    Use the Transfer Case Rear Bushing Remover and Installer (J 45380) by installing the finger section of the tool in front of the bushing, attaching the tube and forcing screw, and then using a wrench on the forcing screw to remove the bushing.
    Posted by ChevyPartsGiant Specialist
    See expert answers on similar Transfer Case Seal
    Q:
    What is the first step to replace the front transfer case output shaft seal for the 2000 Chevrolet K3500? Posted by Customer
    A:
    First, raise the vehicle and, if equipped, remove the transfer case shields.
    Posted by ChevyPartsGiant Specialist
    See expert answers on similar Transfer Case Seal
    Q:
    What is the first step in the process for the 2000 Chevrolet Suburban 1500? Posted by Customer
    A:
    Begin by raising the vehicle and, if equipped, removing the transfer case shields.
    Posted by ChevyPartsGiant Specialist
    See expert answers on similar Transfer Case Seal
    Q:
    What should you do after reinstalling the front propeller shaft for the 2006 Chevrolet Silverado 3500? Posted by Customer
    A:
    Check the fluid level and add fluid if necessary, and reinstall the transfer case shield if equipped.
    Posted by ChevyPartsGiant Specialist
    See expert answers on similar Transfer Case Seal
    Q:
    What is the first step to replace the front output shaft seal of the transfer case for the 2000 Chevrolet Suburban 1500? Posted by Customer
    A:
    Raise the vehicle.
    Posted by ChevyPartsGiant Specialist
    See expert answers on similar Transfer Case Seal
    Q:
    What is the final step after installing the new input shaft seal for the 2007 GMC Sierra 3500 Classic? Posted by Customer
    A:
    Reinstall the transfer case.
    Posted by ChevyPartsGiant Specialist
    See expert answers on similar Transfer Case Seal
    Q:
    What is the first step to replace the front transfer case output shaft seal for the 2006 GMC Sierra 3500? Posted by Customer
    A:
    Remove the transfer case shield if equipped and the front propeller shaft.
    Posted by ChevyPartsGiant Specialist
    See expert answers on similar Transfer Case Seal
    If you have any questions about this product, please don't hesitate to ask us. We will be happy to help you!

OEM GM Extension Housing Seal 12478060 Designed for Proper Fit and Performance

Original OEM GM parts deliver superior quality and meet all performance standards needed for optimal automotive operation. The authentic part identified by 12478060 Extension Housing Seal is available in the market under the name GM Transfer Case Seal. This genuine product has a full warranty coverage from the manufacturer available at all authorized GM dealers throughout the United States. This part 12478060 Extension Housing Seal fits certain Chevrolet Tahoe, Silverado 1500, Silverado 2500 HD models, as well as GMC Sierra 1500, Yukon, Sierra 2500 HD. Additionally, it is compatible with Cadillac Escalade models.
The original GM component designated by manufacturer part number 12478060 maintains top performance when functioning as the Seal, Transmission Extension; Manual Transmission Housing Seal; Gasket Set. unit at its Rear. The component 12478060 is constructed from durable material and its dimensions span 3.7 x 3.8 x 0.5 inches while weighing 0.40 Pounds. The Direct Replacement component is ready in New condition to ensure full compatibility with your vehicle system. This component receives the designation of Seal, Transmission Main Shaft; Seal, Rear Bearing Retaining. The part 12478060 has available replacement options 15635281. GM manufacturer provides a warranty that ensures reliable operation of this product. The Shipping Policy and Return Policy pages outline complete details regarding shipping procedures and return processes.
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