B&M 112004 Prerunner/Trail Automatic Transmission - TH400

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

PART# 112004

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$2,516.00   Suggested Retail
$2,263.95   Your Price
Estimated shipping date: 07/21/2021
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Use with large 1.875 Spicer yoke for 2 wheel drive models. Has 4 inch tailshaft and 7 inch separation on top bellhousing 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 a deep cast aluminum pan. This transmission also features a manual/forward valve body with a 2.48:1 first gear ratio, 1.48:1 second gear. Internal components include rebuilt front pump, 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 silencer ring. Max 600 HP / 550 Ft/Lbs. Intended for off road/trail use.


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

Product Attributes

Emission Code5
Manufacturer Part Number112004
Product TypeAutomatic Transmissions
California Proposition 65 Chemical NameBenzene
Chromium (hexavalent compounds)
California Proposition 65 RequiredYes
Part Number112004



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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