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GM Turbo 400 Deep
Transmission Pan

P/N 9683

PML TH400 Deep tranny pan, as-cast
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PML TH400 Deep tranny pan, powder coated
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PML TH400 Deep tranny pan, polished
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As-cast finish
$195.00
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Black powder coating
$250.00
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Polished finish
$325.00
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Volume: 2 qts. over stock "car" type pan

Dimensions: Click here for dimensions.

Number of Bolts: 13

The PML GM Turbo 400 deep transmission pan fits 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)
  • Hummer H1, 1991 and 1992
  • Jaguar (this pan has been installed on a 1991 XJS)
  • Jeep
  • K1500, K2500, K3500 (2WD and 4WD)
  • Ferrari

The transmission was first available in 1964. This pan is the same depth and capacity as the stock TH400 "truck" pan.

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 has a boss that can be machined for a temperature sensor.

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.

1/17/2008: New design moves drain plug to bottom and temp sensor boss to driver's side. This update allows four wheel drive vehicles, such as Blazers, K1500, K2500, and K3500 to avoid drive shaft interference. The boss on the passenger's side is too small to be machined so a temperature sensor would need to go on the driver's side.

Filter Supports Inside of Pan


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This PML pan is designed to work with the stock filter. Inside the pan, filter supports cast into the pan support the stock filter in the valve body. The filter supports are the round features toward the bottom of the above image, which is the passenger's side of the pan.

PML Transmission Pan Compared to Stock

PML Transmission Pan Part Numbers 9591_9683 height compared to stock  PML Transmission Pan Part Numbers 9683, compared to stock
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These images show this PML transmission pan compared to the stock pan.

PML Transmission Pan Features

  • Increased oil capacity for cooler temperatures
  • 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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