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GM Turbo 400 Stock Capacity
    GM Turbo 400 Stock Capacity
    Purchase GM Turbo 400 Stock Capacity
    • GM Turbo 400 Stock Capacity
      Part Number 9591

    • Pan includes magnetic drain plug and mounting hardware.
      Price varies with finish. SEE PRODUCT INFO.


    • OPTIONAL - add machining of a 1/8 NPT hole for an aftermarket temperature sending unit:

    Volume: stock capacity

    Dimensions: Click here for dimensions. Although this pan is stock capacity, it is still larger than the stock pan. Always check your vehicle for clearance before ordering. Fin height is about 0.270 inches.

    Number of Bolts: 13


    • Thick wall construction for strength
    • Gasket flange machined flat for a secure seal to the transmission housing
    • Finned for heat dissipation
    • Top quality sand cast aluminum
    • Drain and magnetic drain plug for easy servicing

    PML also offers an extra capacity pan for the Turbo 400 transmission. It is PML part number 9683. The PML extra capacity pan has the same capacity as the stock truck TH 400 transmission pan.

    The transmission was first available in 1964.

    The PML GM Turbo 400 stock capacity transmission pan fits many cars and trucks with the GM TH 400 transmission. This transmission is found in GMC and Chevy vehicles such as:

    • 1970-76 models of Corvette, Chevy, Cadillac, Olds, Buick
    • Blazer (2WD and 4WD)
    • K1500, K2500, K3500 (2WD and 4WD)
    • Jaguar
    • Jeep
    • Ferrari

    Always check your vehicle to verify transmission and clearance. This PML pan fits the Turbo 400 transmission. It is larger than stock so make sure to check for clearance for a larger pan.

    If your stock pan has a dipstick receiver on the side of the pan, a PML Turbo 400 pan is not compatible with your vehicle.

    The TH400 transmission is called Super Turbine 400 or Turbo 400 in the racing field and is formally called THM400 for Turbo-Hydra-matic 400. It first appeared in cars in 1964 and continued in production in the 1980s. In 1980s GM changed the name to 3L80.

    1966 Impala

    Dominant Performance Transmissions installed PML's TH400 transmission pan on a 1966 Impala SS Convertible 396 during a transmission upgrade to add strength and cooling.

    GM Turbo 400 transmission pan from PML on 1966 Impala  Click on image to view larger.

    drain on PML TH400 pan

    Drain and Options for Temperature Sensor

    The pan has a drain on the right (passenger) side and a boss on the driver (left) side that can be machined for a temperature sensor.

    Temperature sending unit machining is an additional cost. That option can be added in the shopping cart.

    Included with PML TH400 pan

    Included With Pan

    PML includes new mounting bolts, a magnetic drain plug, and washer with each pan.

    The drain plug has a copper sealing washer.

    Click on image o view larger in a new tab or window.

    Inside of PML TH400 pan


    This PML pan features an open interior to clear the valve body. The hole for the drain is visible at the bottom of the image.

    Filter, Gasket

    This pan is designed to work with the stock filter and gasket. A cork, cork composite, paper or felt type gasket work best with a PML pan.

    This pan works with the stock shallow pan filter tube, bolt and sleeve.

    The early valve body uses a side mount filter. This PML pan is not designed to work with the side mount filter. Some customers have made it work by with modifications to the pan, valve body and filter. One customer drilled a hole in the valve body to hold the "new style" filter in place on his old valve body. He had switched to this new style filter before getting the PML pan. He found the old style filter to be a "bad design" since it kept sucking air.

    PML Transmission Pan Compared to Stock

    PML Transmission Pan Part Numbers 9683 and 9591 compared to stock   PML Transmission Pan Part Number 9591, compared to stock, top view
    Click on image to view larger in a new tab or window.