B&M 112006 Prerunner/Trail Automatic Transmission - TH400

Compatible with 1965-1991 Chevrolet Small Block and Big Block 2-Wheel/Rear Wheel Drive, Automatic Shift Valve Body.

PART# 112006

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$2,018.00   Suggested Retail
$1,815.95   Your Price
Estimated shipping date: 12/31/2021
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For 2 wheel drive models with large 1.875 in. Spicer yoke. Has 4.00 in. tail shaft and 7.00 in. separation on top bell housing bolts. Transmission shipped without speedometer driven gear or housing.


The B&M TH-400 PreRunner/Trail automatic transmission is for RWD GM SB/BB applications. This transmission features a large diameter bushing for use with a large diameter yoke (1-7/8 in) and includes a deep, cast aluminum pan. This transmission also features an automatic/forward valve body, 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, and new adjustable modulator and silencer ring, Max 600 HP/550 Ft/Lbs. Intended for off road/trail use.


  • Rated to 600HP and 550 FT/LBS
  • Automatic/Forward Valve Body
  • Includes Deep Aluminum Pan
  • Intended for Off-Road Use

Product Attributes

Brand B&M
Emission Code5
Manufacturer Part Number112006
Product TypeAutomatic Transmissions
California Proposition 65 Chemical NameBenzene
Chromium (hexavalent compounds)
California Proposition 65 RequiredYes
Part Number112006



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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