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B&M Prerunner/Trail Automatic Transmission - LS Engine 4L80E

1997-2006 LS Engine 2-Wheel Drive, Manual Shift Valve Body

PART# 118003BM

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The B&M PreRunner/Trail 4L80E automatic transmission is for use with all 1997-Up Chevrolet LS based engines with 2WD. This transmission features a forward pattern manual valve body and includes a B&M finned deep aluminum transmission pan for added fluid capacity and cooling. Features include a steel forward hub, 34 element intermediate sprag, high energy intermediate sprag, all new high performance friction plates, new overdrive sprag assembly, new low roller assembly and rebuilt performance pump. We strongly recommend adding a B&M transmission SuperCooler with your new transmission to help reduce high fluid temps that comes with hard off-road use. Max Recommended Power 800HP and 650 Lb/Ft. Note: This transmission will require an electronic controller such as the B&M Shift Plus 2 Transmission Controller part #120001. Carbureted applications will require a throttle position sensor such as B&M #120002. Does not include a torque convertor or speedometer gear.


  • New High Performance Friction Plates
  • Manual Forward Pattern Valve Body
  • B&M Finned Aluminum Deep Pan
  • Rated to 800HP and 650 FT/LBS


Automotive Item GradeHigh Performance
Brake IncludedNo
Built-In Transmission ShieldNo
Case MaterialCast Aluminum
Control TypeElectronic
Cooler includedNo
Core Change ApplicableNo
Dipstick includedNo
Drive TypeRWD
Emission Code5
Friction PlatesNew
Friction Plates:New
Gear Ratio-First2.48
Gear Ratio-Fourth0.75
Gear Ratio-Second1.48
Gear Ratio-Third1.00
Horsepower Rating (HP)800
Horsepower Rating (HP)800
Manual Valve BodyYes
Part TypeHigh Performance
Product TypeAutomatic Transmission Assembly
Reverse Gear Ratio2.07
Reverse PatternNo
Torque Converter IncludedNo
Torque Rating (Ft/Lbs)650
Transmission Model4L80E
Transmission Pan FinishNatural
Transmission Pan MaterialAluminum
Transmission Pan TypeDeep, Cast
Transmission SeriesPrerunner/Trail
Transmission Speeds4
Transmission Type4L80E
Valve Body ConfigurationRecalibrated
Valve Body PatternForward
Valve Body TypeManual
California Proposition 65 Chemical NameBenzene
Chromium (hexavalent compounds)
California Proposition 65 RequiredYes
Part Number118003BM



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

Can be used with HGM Compushift Controller for transplant applications.For use on LS type engines. Transmission shipped without speedometer driven gear or housing.


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