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B&M Hi-Tek Deep Trans Pan for GM TH400 Transmission

Deep Aluminum Transmission Pan

PART# 20280

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$200.00   Suggested Retail
$161.96   Holleydays Price
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Our Hi-Tek deep transmission pans are constructed from A356-T6 aluminum and are cast with thick internal and external fins, adding additional strength and increased cooling properties. The deep pan design increases fluid capacity by 2-quarts over the stock O.E. steel pan. All these features combined help dissipate heat quicker netting lower transmission and fluid temperatures prolonging the life of your transmission, transmission fluid and corresponding components. Other features for this popular pan include a filter extension, pan gasket and drain port with magnetic drain plug for clean and easy servicing. Also includes a 1/8 inch NPT temperature sensor port for easily adding a temp gauge for monitoring transmission temperatures while daily driving, towing or racing. Includes detailed instructions with all necessary hardware for an easy at home installation.


  • Includes Drain Port & Magnetic Drain Plug
  • Include Fluid Pickup Extension & Gasket
  • Adds Additional 2-quart Fluid Capacity
  • Includes Sensor Temperature Port
  • Over 65 Years of B&M Quality
  • Increased Cooling Properties
  • Lifetime Limited Warranty


Additional Fluid Capacity (qts)2
Drain Plug IncludedYes
Drain Plug KitYes
Emission Code5
Filter Extension IncludedYes
Filter IncludedNo
Gasket IncludedYes
Instructions IncludedYes
MaterialCast Aluminum
Mounting HardwareYes
Product TypeAutomatic Transmission Oil Pan
Temperature Sensor BungYes
Transmission TypeGM TH400
California Proposition 65 Chemical NameChromium (hexavalent compounds)
California Proposition 65 RequiredYes
Part Number20280



This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.

In The Box

In The Box

  • Transmission pan
  • pan gasket
  • drain plug with seal
  • filter extension
  • o-rings
  • filter extension screws
  • nuts
  • bolts
  • washers and instructions

Tech Resources

All GM Turbo-Hydramatic 400 automatic transmissions. Adds an additional 2-quarts of capacity. Does not fit Jeep CJ7 model. Does not include transmission filter.


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        Some parts are not legal for use in California or other states with similar regulations.

         X  Holleydays 2020 20% off and DD
         X  Holleydays 2020 20% off and DD