B&M Nitrous Holeshot 3500 Torque Converter, GM TH350, TH375B, TH400, TH425

10" diameter torque converter with 10.75" bolt pattern 3200-3500 RPM stall for 1965-1991 TH400, TH425, TH350 and 1968-1981 TH350, TH375B.

PART# 20484

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$438.95   Suggested Retail
$394.95   Your Price
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Fits vehicles with GM TH400, TH425, TH375 & TH350 Automatic Transmissions


With the addition of anti-balloon plates, the nitrous Holeshot is the strongest of the B&M street Converter line. These convertes will take the "instant hit" abuse of plate-type nitrous systems, and are also tough enough to hndle the high power and torque of big cubic inch crate engines. All nitrous HoleShot converters are completely balanced with full furnace brazed impellaer and turbine, hevy duty needle type thrust bearings. new turbine hubs and anti-ballon paltes, these are serious converters for serious performance street cars. Listed converters are NOT to be used in trans-brake applications. To prevent contamination left from worn parts are being circulated in your new componetns and causing premature wear, we strongly reccomend protecting your investment by adding a B&M transmission cooler with all new transmission installations.


  • Steel Alloy Pump Drive Tube
  • Furnace Brazed Impeller and Turbine
  • Higher Stall Speed, Quicker Acceleration
  • Needle Bearing Between Stator and Turbine


Additional ContentsNew needle bearings
Anti Balloon PlateYes
Automotive Item GradeHigh Performance
Bolt Circle Diameter (in)10.75
California Proposition 65 RequiredNo
Crank Pilot Diameter (in)1.71
Emission Code5
FlexPlate Bolt Circle10-3/4", 11-1/2"
Flexplate Change NeededNo
Furnace BrazedYes
Lockup TypeNo
Mounting StudsNo
Product TypeTorque Converters
Stall Speed3200-3500
Torque Converter SeriesNitrous Holeshot
Transmission ModelTH400, TH425, TH375, TH350
Part Number20484


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

  • Torque Converter
  • Mounting Hardware

Tech Resources

Fits vehicles with GM TH400, TH425, TH375 & TH350 Automatic Transmissions



    *Free Shipping & Handling only offered to the contiguous US on orders over $100, excludes clearance parts and oversized packages.

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