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GMC 1358899 Seal

1983-1997 GMC

Customer Questions & Expert Answers (2)
1358899 GM Seal Product Photo 1 of 1
1358899 GM Seal Product Photo 1 of 1
1358899 GM Seal Illustration 1 of 1
  • Part Description
    Seal, Automatic Transmission Case Extension
  • Manufacturer
    General Motors
Make sure this part fits
$3.24 MSRP: $4.98
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  • Specifications
  • Fitment
  • Q&A

  • Related Parts

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  • Product Specifications

    BrandGenuine GMC
    Manufacturer Part Number1358899
    Part DescriptionSeal; Seal, Automatic Transmission Case Extension
    Item Dimensions5.6 x 5.7 x 3.2 inches
    Item Weight0.40 Pounds
    ConditionNew
    Fitment TypeDirect Replacement
    ManufacturerGeneral Motors
    SKU1358899
    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
    1988-1997, 1985-1986 GMC C15006 Cyl 4.3L, 8 Cyl 5.0L, 8 Cyl 5.7L, 8 Cyl 6.2L Diesel, 8 Cyl 6.5L DieselC1500 EXTENDED CAB LONG BOX, C1500 EXTENDED CAB STANDARD BOX, C1500 REGULAR CAB LONG BOX, C1500 REGULAR CAB STANDARD BOX, REGULAR CAB LONG BOX, REGULAR CAB STANDARD BOX
    1988-1997, 1985-1986 GMC C25006 Cyl 4.3L, 6 Cyl 4.8L, 8 Cyl 5.0L, 8 Cyl 5.7L, 8 Cyl 6.2L Diesel, 8 Cyl 6.5L Diesel, 8 Cyl 7.4LC2500 EXTENDED CAB LONG BOX, C2500 EXTENDED CAB STANDARD BOX, C2500 REGULAR CAB, CREW CAB, REGULAR CAB
    1988-1991, 1985-1986 GMC C35006 Cyl 4.8L, 8 Cyl 5.0L, 8 Cyl 5.7L, 8 Cyl 6.2L Diesel, 8 Cyl 7.4LC3500 CAB CHASSIS 135.5, C3500 CAB CHASSIS 159.9, C3500 CAB CHASSIS 183.5, C3500 EXTENDED CAB, C3500 REGULAR CAB, CAB CHASSIS 135.5, CAB CHASSIS 159.9, CREW CAB, REGULAR CAB
    1985-1995 GMC G15006 Cyl 4.3L, 8 Cyl 5.0L, 8 Cyl 5.7L1/2 TON CARGO, 1/2 TON PASSENGER
    1985-1995 GMC G25006 Cyl 4.3L, 8 Cyl 5.0L, 8 Cyl 5.7L, 8 Cyl 6.2L Diesel, 8 Cyl 6.5L Diesel1/2 TON CARGO, 1/2 TON PASSENGER, 3/4 TON CARGO, 3/4 TON PASSENGER
    1985-1995 GMC G35006 Cyl 4.3L, 8 Cyl 5.7L, 8 Cyl 6.2L Diesel, 8 Cyl 6.5L Diesel, 8 Cyl 7.4L1 TON CARGO, 1 TON CARGO VAN, 1 TON COMMERCIAL/RECREATIONAL VEHICLE, 1 TON PASSENGER
    1985-1997 GMC Jimmy6 Cyl 2.8L, 6 Cyl 4.3L, 8 Cyl 5.0L, 8 Cyl 5.7L, 8 Cyl 6.2L Diesel1/2 TON, 2 DOOR, 4 DOOR
    1988-1997, 1985-1986 GMC K15006 Cyl 4.3L, 8 Cyl 5.0L, 8 Cyl 5.7L, 8 Cyl 6.2L Diesel, 8 Cyl 6.5L DieselK1500 EXTENDED CAB LONG BOX, K1500 EXTENDED CAB STANDARD BOX, K1500 REGULAR CAB LONG BOX, K1500 REGULAR CAB STANDARD BOX, REGULAR CAB LONG BOX, REGULAR CAB STANDARD BOX
    1988-1997, 1985-1986 GMC K25006 Cyl 4.3L, 6 Cyl 4.8L, 8 Cyl 5.0L, 8 Cyl 5.7L, 8 Cyl 6.2L Diesel, 8 Cyl 6.5L Diesel, 8 Cyl 7.4LK2500 EXTENDED CAB LONG BOX, K2500 EXTENDED CAB STANDARD BOX, K2500 REGULAR CAB, REGULAR CAB
    1996-1997, 1988-1992, 1985-1986 GMC K35006 Cyl 4.8L, 8 Cyl 5.7L, 8 Cyl 6.2L Diesel, 8 Cyl 6.5L Diesel, 8 Cyl 7.4LCAB CHASSIS 135.5, CAB CHASSIS 159.9, CREW CAB, K3500 CAB CHASSIS 135.5, K3500 CAB CHASSIS 159.9, K3500 CREW CAB LONG WHEELBASE, K3500 EXTENDED CAB, K3500 REGULAR CAB, REGULAR CAB
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  • 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 1358899 fits your vehicle.
    Posted and answered by GM Parts Specialist Julian
    Q:
    How to replace the speedometer gear seal and Transfer Case Seal on Chevrolet El Camino? Posted by Kazun A.
    A:
    The following oil seals can be replaced without removing the transmission from the car. For the speedometer gear seal, raise the vehicle for access beneath and set it firmly on stands. Disconnect the speedometer cable, remove the lockplate to extension bolt and lockwasher, then take out the lockplate. Use a screwdriver to pry the fitting gear and shaft from the extension, and then pry out the O-ring. Installation is the reverse of removal; lubricate the new seal with transmission lubricant and ensure the slot in the fitting is towards the lockplate boss on the extension. For the extension oil seal, first remove the drive shaft and any ancillary items necessary for additional clearance. Carefully pry out the old seal, clean the counterbore, and examine it for any damage. Pre-lubricate between the lips of the new seal with transmission lubricant and coat the outer diameter with a suitable sealant. Install the seal with the lips inwards until the flange seats, ideally using a tubular spacer for this job. Finally, reinstall the drive shaft and any other ancillary items that were removed.
    You can Select Your Vehicle to see complete installation and repair tips.
    Answered by GM Parts Specialist Jeremy / Mar 24, 2026

Genuine GM Part 1358899, the Right Choice

To ensure reliability, purchase GM part # 1358899 Seal. It is sometimes referred to as GMC Transfer Case Seal, GMC Transmission Gasket, GMC Automatic Transmission Seal. 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 GMC C2500, Suburban, Yukon models.

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