B&M 112003 Street/Strip Automatic Transmission - Buick, Oldsmobile, Pontiac TH400

1965-1991 GM (Includes BOP Engine Adapter) 2-Wheel/Rear Wheel Drive, Automatic Shift Valve Body.

PART# 112003

Be the first to write a review
$1,517.00   Suggested Retail
$1,364.95   Your Price
Estimated shipping date: 02/15/2021
Email Me When Available
 Ships via Truck Freight - Additional Charges Apply
Add to Wish List


B&M Racing Street/Strip T400 Automatic transmission for Buick, Oldsmobile and Pontiac applications with large diameter bushing for use with large 1.875 inch Spicer yoke (part number 2-3-10431X.) This transmission is a complete ready to run unit (less converter) for high performance street and mild strip use. Since Chevrolet based T400 cores are getting harder to find, we've included a B&M Racing B.O.P./Chevy adapter plate so you can also use this transmission on 62 and later small block and big block Chevy engines. This transmission provides firm shifts and features a standard forward shift pattern. Includes a 2.48:1 first gear ratio, 1.48:1 second gear, rebuilt front pump utilizes B&M pressure regulator spring and shims, all new B&M high performance friction plates, new intermediate roller clutch, new kickdown band with welded anchors, machined center support with new case saver ring, all new thrust bearings and races, new adjustable modulator and silencer ring, new external electric connector, kickdown solenoid and a recalibrated valve body. Transmission has a 4.00 in. tailshaft. Recommended max 600 HP and 550 Lb Ft.


  • Includes B&M B.O.P. Transmission to Chevy Engine Adapter
  • High Performance Street/Strip Applications
  • Fits Buick, Oldsmobile and Pontiac Engines
  • Recalibrated Valve Body and Chrome Pan
  • Over 65 Years of Proven B&M Quality
  • High Performance Friction Materials
  • New Intermediate Roller Clutch

Product Attributes

Emission Code5
Product TypeAutomatic Transmissions
California Proposition 65 Chemical NameBenzene
Chromium (hexavalent compounds)
California Proposition 65 RequiredYes
Part Number112003



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.

Tech Resources

For 1965-1991 GM Buick, Oldsmobile and Pontiac or Chevrolet engines with included B.O.P. Engine Adapter) 2-Wheel/Rear Wheel Drive, Automatic Shift Valve Body.


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.