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Hard Core Off-Road Race Transmission - B&M Rock/Race TH400 - Part 112005YouTube Button

B&M Rock/Race Off-Road Automatic Transmission - GM TH400

1965-2003 Chevrolet Small Block, Big Block, LS, and GM 4.3 V6 engine, 2-Wheel/Rear Wheel Drive - SFI Certified Bellhousing.

PART# 112005

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B&M Performance and Off-Road introduces the new Rock/Race GM TH400 Automatic transmission specifically designed and built for Off-Road competition. The foundation starts with a tough and tested Reid Racing Super Hydra 400 Off-road race case and SFI 30.1 certification bellhousing that fits all Chevrolet 90 degree V8's including early and late LS engines and 4.3L V6 engines. Upgrades include a new super tough 300M (Rockwell Hardness) alloy steel 30 spline input shaft, 34 element direct drum and a wide Intermediate band for increased engine braking capability, strength and performance. Other features include a Billet 1045 alloy steel forward hub with bearing, four friction Intermediate clutch pack and a Reid Racing tailhousing with roller bearing providing superior support for the 32 spline output shaft. The forward pattern manual valve body has been re-calibrated to ensure constant pressure, quick shift response and provides engine braking. The transmission is finished off with a B&M Hi-Tek finned aluminum trans pan which both increases fluid capacity and quickly dissipates heat generated by tough off-road race conditions. Handles up to 900 HP/900 LB/FT


  • Reid Racing Tail housing with Roller Bearing Providing Superior Support for the 32 Spline Output Shaft
  • Includes B&M Hi-Tek Finned Aluminum Transmission Pan for Extra Capacity and Cooling
  • Has Wide Intermediate Band for Increased Engine Braking Capability
  • Designed to Handle up to 900 Horsepower & 900 Ft/lbs of Torque
  • Super Tough 300M Alloy Steel 30 Spline Input Shaft
  • Billet 1045 Alloy Steel Forward Hub w/Bearing
  • Bellhousing Meets SFI 30.1 Certification
  • Four Friction Intermediate Clutch Pack
  • Recalibrated Manual Valve Body


Cooler includedNo
Dipstick includedNo
Drive TypeRWD
Emission Code5
Friction PlatesNew
Horsepower Rating (HP)900
Input Spline Count30
Output Spline Count32
Part TypeRace
Product TypeAutomatic Transmission Assembly
SFI Certification30.1
Tailshaft Length (In)4
Torque Converter IncludedNo
Torque Rating (Ft/Lbs)900
Transmission ModelTH400
Transmission Pan FinishNatural
Transmission Pan MaterialAluminum
Transmission Pan TypeHi-Tek Deep Cast
Transmission SeriesRock Race
Transmission Speeds3
Valve Body ConfigurationRecalibrated
Valve Body PatternForward
Valve Body TypeManual
California Proposition 65 Chemical NameBenzene
Chromium (hexavalent compounds)
California Proposition 65 RequiredYes
Part Number112005

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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.

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1965-2003 Chevrolet Small Block, Big Block, LS, and GM 4.3 V6 engine, 2-Wheel/Rear Wheel Drive - SFI Certified Bellhousing
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