B&M 112005 Rock/Race Off-Road Automatic Transmission - TH400

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

PART# 112005

Be the first to write a review
$7,613.00   Suggested Retail
$6,850.95   Your Price
Estimated shipping date: 10/26/2021
Email Me When Available
 Ships via Truck Freight - Additional Charges Apply
Add to Wish List

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


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

Product Attributes

Brand B&M
Emission Code5
Manufacturer Part Number112005
Product TypeAutomatic Transmissions
California Proposition 65 Chemical NameBenzene
Chromium (hexavalent compounds)
California Proposition 65 RequiredYes
Part Number112005



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.

Product Reviews

    *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.