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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. 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

    Although this pan is stock capacity, it is still larger than the stock pan. Always check your vehicle for clearance before ordering.

    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.

    1971 C10

    Gary installed this pan on his lowered 1971 Chevy C10. The pan fit great and did not cause any clearance issues.

    1971 Chevy C10   PML gm th400 pan on 1971 C10  Click on image to view larger.

    1969 Nova SS

    Joe installed this pan on his 1969 Nova SS with a 396/375 HP motor and Turbo 400 transmission. The Nova is all original, except for this pan. He painted the PML pan satin black and it looks great. Joe tried using a Moroso blue silicon gasket and it leaked so he switched to a non silicon gasket that expands after coming into contact with the trans fluid.

    PML Turbo 400 pan on a 1969 Nova SS 396 PML Turbo 400 transmission pan on a 1969 Nova SS   PML TH400 pan on a Nova, view from rear view of PML pan from rear   Click on image to view larger in a new tab or window.

    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 and Options for Temperature Sensor

    drain on PML TH400 pan  Click on image to view larger.

    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 Pan

    Included with PML TH400 pan  Click on image to view larger.

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

    The drain plug has a copper sealing washer.

    Inside of PML Pan

    Inside of PML TH400 pan  Click on image to view larger.

    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, and Tube

    Note: Installer must use the correct filter, intake tube and sleeve/bolt/spacer kit for the vehicle configuration. PML is not responsible for any damage or injury.

    GM made at least two different pans for the Turbo 400 transmission.

    • One is called the shallow or 2WD or car stock pan and the GM part number is 8679995
    • One is called the deep or or 4WD or truck stock pan and the GM part number is 8679994

    The OEM pans had different intake tubes and bolt/sleeve kits. They used the same filter and gasket.

    For the filter, this pan is designed to work with the regular OEM filter. It is some times called the flat filter.

    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. A customer recommended cork composite Mr. Gasket 8691.

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

    Pictures of a gasket and filter for the GM TH400 transmission:
    GM Turbo 400 gasket and filter GM Turbo 400 gasket and filter   cork gasket thickness, Turbo 400 cork gasket thickness   cork gasket on PML TH400 pan gasket on PML GM TH400 transmission pan
    Click on image to view larger.

    Early Valve Body

    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.

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