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GM Turbo 400 Stock Capacity
Transmission Pan

P/N 9591

PML TH400 stock tranny pan, as-cast
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PML TH400 stock tranny pan, powder coated
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PML TH400 stock tranny pan, polished
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As-cast finish
$190.00
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Black powder coating
$245.00
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Polished finish
$320.00
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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.

Number of Bolts: 13

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

The transmission was first available in 1964.

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

The pan a drain on the passenger's side and a boss on the driver's side that can be machined for a temperature sensor.

PML also offers an extra capacity deep pan for these applications. The deep pan has the same capacity as the stock truck TH 400 transmission pan.

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.

PML Transmission Pan Compared to Stock

PML Transmission Pan Part Number 9591 height compared to stock  PML Transmission Pan Part Numbers 9591, compared to stock
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These images show this PML transmission pan compared to the stock pan.

Installation

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

Watch a video of installation.

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

PML Transmission Pan Features:

  • Sand-cast aluminum with raised fins
  • 3/16-inch thick wall construction to add strength to the transmission case
  • 3/8-inch thick gasket flange will not bend when bolts are tightened
  • Machined gasket surface for a secure seal
  • Boss cast into pan can be machined for a temperature sensor
  • Drain hole and magnetic drain plug for easier, less messy maintenance

All PML transmission pans ship with new mounting bolts and a magnetic drain plug.

If you would like PML to machine your pan for a temperature sending unit, there is an additional charge of $40.

Find out why you should buy a PML transmission pan.

Learn more about finishes and construction of PML parts.

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