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Pontiac 1358899 Seal

1982-1997 Pontiac

Customer Questions & Expert Answers (2)
1358899 GM Seal Product Photo 1 of 1
  • Part Description
    Seal, Automatic Transmission Case Extension
  • Manufacturer
    General Motors
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  • Specifications
  • Fitment
  • Q&A
  • Product Specifications

    BrandGenuine Pontiac
    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
    1982-1984 Pontiac Bonneville6 Cyl 3.8L, 6 Cyl 4.1L, 8 Cyl 5.0L, 8 Cyl 5.7L Diesel2 DOOR, 4 DOOR, BROUGHAM 2 DOOR, LE 2 DOOR, STATION WAGON
    1983-1997 Pontiac Firebird4 Cyl 2.5L, 6 Cyl 2.8L, 6 Cyl 3.1L, 6 Cyl 3.4L, 6 Cyl 3.8L, 8 Cyl 5.0L, 8 Cyl 5.7L2 DOOR, CONVERTIBLE
    1982-1984 Pontiac Grand Prix6 Cyl 3.8L, 6 Cyl 4.1L, 8 Cyl 5.0L, 8 Cyl 5.7L Diesel2 DOOR, 4 DOOR, BROUGHAM 2 DOOR, LE 2 DOOR, STATION WAGON
    1983-1986 Pontiac Parisienne6 Cyl 3.8L, 6 Cyl 4.3L, 8 Cyl 5.0L, 8 Cyl 5.7L Diesel4 DOOR, BROUGHAM, STATION WAGON
  • 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 Pontiac Transfer Case Seal, Pontiac Transmission Gasket, Pontiac 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 Pontiac Bonneville, Firebird, Grand Prix models.

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