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B&M Prerunner/Trail Automatic Transmission - GM TH400

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

PART# 112004

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$2,466.00   Suggested Retail
$1,997.06   Holleydays Price
Estimated shipping date: 12/31/2020
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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


Automotive Item GradeHigh Performance
Brake IncludedNo
Built-In Transmission ShieldNo
Case MaterialCast Aluminum
Control TypeHydraulic
Cooler includedNo
Core Change ApplicableNo
Dipstick includedNo
Drive TypeRWD
Emission Code5
Friction PlatesNew
Gear Ratio-First2.48
Gear Ratio-Second1.48
Gear Ratio-Third1.00
Horsepower Rating (HP)600
Horsepower Rating (HP)600
Manual Valve BodyYes
Part TypeOff Road
Product TypeAutomatic Transmission Assembly
Reverse Gear Ratio2.00
Reverse PatternNo
Tailshaft Length (In)4
Torque Converter IncludedNo
Torque Rating (Ft/Lbs)550
Transmission ModelTH400
Transmission Pan FinishNatural
Transmission Pan MaterialAluminum
Transmission Pan TypeDeep, Cast
Transmission SeriesPrerunner/Trail
Transmission Speeds3
Transmission TypeTH400
Valve Body ConfigurationRecalibrated
Valve Body PatternForward
Valve Body TypeManual
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.

Tech Resources

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.


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