Make sure this part fits

GM 12587621
Rear Main Seal

2001-2007 GM

Customer Questions & Expert Answers (9)
GM 12587621 Rear Main Seal
  • Part Description
    Seal, Engine Rear Main Bearing; Crankshaft Seal
  • Position
    Rear
  • Replaces
    12559277
  • Manufacturer
    General Motors
Make sure this part fits
$37.56 MSRP: $63.95
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  • Vehicle Fitment

    Year Make Model Trim Engine
    2002-2006 Chevrolet Avalanche 2500Base, LS, LT8 Cyl 8.1 L GAS
    2001-2002 Chevrolet Express 3500Base, LS8 Cyl 8.1 L GAS
    2001-2006 Chevrolet Silverado 2500 HDBase, LS, LT, WT8 Cyl 8.1 L GAS
    2007 Chevrolet Silverado 2500 HD ClassicLS, LT, WT8 Cyl 8.1 L GAS
    2001-2006 Chevrolet Silverado 3500Base, LS, LT, WT8 Cyl 8.1 L GAS
    2007 Chevrolet Silverado 3500 ClassicLS, LT, WT8 Cyl 8.1 L GAS
    2001-2006 Chevrolet Suburban 2500Base, LS, LT8 Cyl 8.1 L GAS
    2001-2002 GMC Savana 3500Base, SLT8 Cyl 8.1 L GAS
    2001-2006 GMC Sierra 2500 HDBase, SL, SLE, SLT, WT8 Cyl 8.1 L GAS
    2007 GMC Sierra 2500 HD ClassicSL, SLE, SLT, WT8 Cyl 8.1 L GAS
    View More
    Warning: California's Proposition 65
  • Customer Questions & Expert Answers

    Q:
    Is this 12587621 designed for my car? Posted by ChevyPartsGiant Specialist
    A:
    Please Select Your Vehicle model to see if part number 12587621 is suitable before ordering.
    Posted by ChevyPartsGiant Specialist
    Q:
    What is the final step after installing the oil seal for the 2002 Chevrolet Avalanche 2500? Posted by Customer
    A:
    Remove the Front Cover Oil Seal Installer (J 42851) and reinstall the crankshaft balancer.
    Posted by ChevyPartsGiant Specialist
    See vehicle specific detailed answers for this Crankshaft Seal
    Q:
    What should be inspected after removing the crankshaft front oil seal for the 2001 Chevrolet Express 3500? Posted by Customer
    A:
    Inspect the engine front cover seal bore and the crankshaft balancer sealing surface for any damage.
    Posted by ChevyPartsGiant Specialist
    See vehicle specific detailed answers for this Crankshaft Seal
    Q:
    What is the final step after replacing the oil seal for the 2006 Chevrolet Silverado 3500? Posted by Customer
    A:
    Reinstall the crankshaft balancer.
    Posted by ChevyPartsGiant Specialist
    See vehicle specific detailed answers for this Crankshaft Seal
    Q:
    What should be avoided when handling the oil seal for the 2007 Chevrolet Silverado 3500 Classic? Posted by Customer
    A:
    Do not lubricate the oil seal sealing surface and avoid reusing the crankshaft oil seal.
    Posted by ChevyPartsGiant Specialist
    See vehicle specific detailed answers for this Crankshaft Seal
    Q:
    What is the first step to replace the crankshaft front oil seal for the 2002 Chevrolet Suburban 2500? Posted by Customer
    A:
    Remove the crankshaft balancer, taking care not to damage the engine front cover or the crankshaft sealing area.
    Posted by ChevyPartsGiant Specialist
    See vehicle specific detailed answers for this Crankshaft Seal
    Q:
    What should be verified after installing the crankshaft front seal for the 2002 GMC Savana 3500? Posted by Customer
    A:
    That the crankshaft front seal is flush and square to the engine front cover.
    Posted by ChevyPartsGiant Specialist
    See vehicle specific detailed answers for this Crankshaft Seal
    Q:
    What is the first step to replace the crankshaft front oil seal for the 2006 GMC Sierra 3500? Posted by Customer
    A:
    Remove the crankshaft balancer, taking care not to damage the engine front cover or the crankshaft sealing area.
    Posted by ChevyPartsGiant Specialist
    See vehicle specific detailed answers for this Crankshaft Seal
    Q:
    What is the process for installing the oil seal for the 2007 GMC Sierra 3500 Classic? Posted by Customer
    A:
    Install the crankshaft front oil seal onto the J 41478 guide, insert the threaded rod into the end of the crankshaft, and use the J 41478 to install the oil seal into the cover bore.
    Posted by ChevyPartsGiant Specialist
    See vehicle specific detailed answers for this Crankshaft 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 Rear Main Seal 12587621 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 12587621 Rear Main Seal is available in the market under the name GM Crankshaft Seal. This genuine product has a full warranty coverage from the manufacturer available at all authorized GM dealers throughout the United States. This part 12587621 Rear Main Seal fits certain Chevrolet Silverado 2500 HD, Express 3500, Silverado 3500 models, as well as GMC Sierra 2500 HD, Savana 3500, Sierra 3500 models.
The original GM component designated by manufacturer part number 12587621 maintains top performance when functioning as the Seal, Engine Rear Main Bearing; Crankshaft Seal unit at its Rear. The component 12587621 is constructed from durable material and its dimensions span 5.3 x 5.5 x 0.6 inches while weighing 0.50 Pounds. The Direct Replacement component is ready in New condition to ensure full compatibility with your vehicle system. The part 12587621 has available replacement options 12559277. 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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