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B&M Nitrous HoleShot 3800 Torque Converter, 1965-91 GM TH400, TH425 TH375B, 1965-81 GM TH350 20485

B&M Nitrous HoleShot 3800 Torque Converter, 1965-91 GM TH400, TH425 TH375B, 1965-81 GM TH350 20485
B&M Nitrous HoleShot 3800 Torque Converter, 1965-91 GM TH400, TH425 TH375B, 1965-81 GM TH350 20485B&M Nitrous HoleShot 3800 Torque Converter, 1965-91 GM TH400, TH425 TH375B, 1965-81 GM TH350 20485B&M Nitrous HoleShot 3800 Torque Converter, 1965-91 GM TH400, TH425 TH375B, 1965-81 GM TH350 20485B&M Nitrous HoleShot 3800 Torque Converter, 1965-91 GM TH400, TH425 TH375B, 1965-81 GM TH350 20485B&M Nitrous HoleShot 3800 Torque Converter, 1965-91 GM TH400, TH425 TH375B, 1965-81 GM TH350 20485B&M Nitrous HoleShot 3800 Torque Converter, 1965-91 GM TH400, TH425 TH375B, 1965-81 GM TH350 20485B&M Nitrous HoleShot 3800 Torque Converter, 1965-91 GM TH400, TH425 TH375B, 1965-81 GM TH350 20485B&M Nitrous HoleShot 3800 Torque Converter, 1965-91 GM TH400, TH425 TH375B, 1965-81 GM TH350 20485
$532.99 ea
NEWARRIVING SOONEstimated Ship Date 06/04/2025 (If Ordered Today)
Model: 3998157
Select a Vehicle or refer to the Vehicle Fitment Tab below to verify that this part fits your vehicle.
STANDARD
DELIVERY
STORE PICKUP
[More Info]
B&M Nitrous HoleShot 3800 stall for GM 1965-91 TH400, TH425, TH375 and 1968-81 TH350, TH375B (not TH350C.) The Nitrous Holeshot 3800 stall converter is an excellent choice for vehicles with engine modifications, particularly big cams that tend to reduce low end power and torque. The higher stall speed of this converter will launch the car in a higher rpm range where more torque is readily available, resulting in quicker acceleration. Nitrous Holeshot converters feature furnace brazed impeller and turbine, new precision steel alloy pump drive tube, new heavy duty needle bearings between the stator and impeller (not a thrust washer) and needle bearings between the stator and turbine. Other features include a new turbine hub, new springs and rollers in the stator and anti-balloon plates. The anti-balloon plates will allow these converters to stand up to the instant horsepower that a Nitrous plate or fogger system delivers. These are serious converters for serious performance street cars. To prevent contamination left from worn parts being circulated in your new components causing premature wear, we strongly recommend protecting your investment by adding a B&M transmission cooler with all new transmission installations. Listed converters are NOT to be used in trans-brake applications. Not for use in trans-brake applications.
Features:
  • Fully Balanced and Pressure Tested
  • Dual pattern 10.75 and 11.50-inch bolt circle
  • Needle Bearing Between Stator and Turbine
  • Furnace Brazed Impeller and Turbine
  • Anti-balloon Plate for Added Strength
  • Steel Alloy Pump Drive Tube
  • Higher Stall Speed, Quicker Acceleration
  • B&M Quality & Durability
"Fits vehicles with GM TH400, TH425, TH375 & TH350, TH375B (Not TH350C) Automatic Transmissions NOTE:
Installation Notes:
"Fits vehicles with GM TH400, TH425, TH375 & TH350, TH375B (Not TH350C) Automatic Transmissions NOTE:
About B&M Racing

B&M® specializes in performance automatic transmissions, torque converters, SFI approved flexplates, legendary automatic shifters, precision manual shifters, and many other transmission products including cast deep aluminum transmission pans, transmission coolers, and automatic transmission fluid. B&M Performance & Off-Road has been at the vanguard of the growing automotive aftermarket since the early 1950s. Racers themselves, B&M’s founders identified the needs of local performance enthusiasts and developed products to fill those needs. B&M specializes in performance automatic transmissions, torque converters, SFI approved flexplates, legendary automatic shifters, precision manual shifters, automatic shift handles, extended transfer case handles, cast deep aluminum transmission pans, differential covers, transmission coolers, power steering coolers, automatic transmission fluid, and transmission accessories for performance street, truck, Jeep, and off-road applications.

Downloads:

Download Name File Size
20485.pdf198.18KB

Vehicle Fitment:

The Vehicle Fitment Guide is to be used as a general reference. The data has been provided by our suppliers and manufacturers and may contain errors or incorrect data. Always refer to a professional to verify correct fitment for your vehicle.
Make Model Submodel Years Engine
Chevrolet Corvette Base 1967 7.0L / 427 / V8
5.3L / 327 / V8
Chevrolet Corvette Base 1968 7.0L / 427 / V8
5.3L / 327 / V8
Chevrolet Corvette Base 1969 7.0L / 427 / V8
5.7L / 350 / V8
Chevrolet Corvette Base 1970 7.4L / 454 / V8
5.7L / 350 / V8
Chevrolet Corvette Base 1971 7.4L / 454 / V8
5.7L / 350 / V8
Chevrolet Corvette Base 1972 7.4L / 454 / V8
5.7L / 350 / V8
Chevrolet Corvette Base 1973 7.4L / 454 / V8
5.7L / 350 / V8
Chevrolet Corvette Base 1974 7.4L / 454 / V8
5.7L / 350 / V8
Chevrolet Corvette Base 1977 5.7L / 350 / V8
Chevrolet Corvette Base 1978 5.7L / 350 / V8
Chevrolet Corvette Base 1979 5.7L / 350 / V8
Chevrolet Corvette Base 1980 5.0L / 305 / V8
5.7L / 350 / V8
Chevrolet Corvette Indianapolis 500 Pace Car 1978 5.7L / 350 / V8
Chevrolet Corvette Silver Anniversary Edition 1978 5.7L / 350 / V8
Chevrolet Corvette Stingray 1975 5.7L / 350 / V8
Chevrolet Corvette Stingray 1976 5.7L / 350 / V8
Chevrolet Corvette 1965 5.3L / 327 / V8
Chevrolet Corvette 1966 7.0L / 427 / V8
Chevrolet Corvette 1967 7.0L / 427 / V8
Chevrolet Corvette 1968 7.0L / 427 / V8
Chevrolet Corvette 1969 5.7L / 350 / V8
Chevrolet Corvette 1970 5.7L / 350 / V8
Chevrolet Corvette 1971 5.7L / 350 / V8
Chevrolet Corvette 1972 5.7L / 350 / V8
Chevrolet Corvette 1973 5.7L / 350 / V8
Chevrolet Corvette 1974 5.7L / 350 / V8
Chevrolet Corvette 1975 5.7L / 350 / V8
Chevrolet Corvette 1976 5.7L / 350 / V8
Chevrolet Corvette 1977 5.7L / 350 / V8
Chevrolet Corvette 1978 5.7L / 350 / V8
Chevrolet Corvette 1979 5.7L / 350 / V8
Chevrolet Corvette 1980 5.7L / 350 / V8
Chevrolet Corvette 1981 5.7L / 350 / V8
Chevrolet Corvette 1982 5.7L / 350 / V8
Chevrolet Corvette 1984 5.7L / 350 / V8
Chevrolet Corvette 1985 5.7L / 350 / V8
Chevrolet Corvette 1986 5.7L / 350 / V8
Chevrolet Corvette 1987 5.7L / 350 / V8
Chevrolet Corvette 1988 5.7L / 350 / V8
Chevrolet Corvette 1989 5.7L / 350 / V8
Chevrolet Corvette 1990 5.7L / 350 / V8
Chevrolet Corvette 1991 5.7L / 350 / V8

Specifications:

Additional Contents New needle bearings
Anti-Balloon Plate Yes
Automotive Item Grade High Performance
Bolt Circle Diameter (in) 10.75
California Proposition 65 Required No
Crank Pilot Diameter (in) 1.71
Emission Code 5
FlexPlate Bolt Circle 10-3/4", 11-1/2"
Flexplate Change Needed No
Furnace Brazed Yes
Input Spline 30
Lockup No
Lockup Type No
Material Steel
Mounting Studs No
Part Type Automatic Transmission Torque Converter
Product Type Automatic Transmission Torque Converter
Stall 3,500-3,800
Stall Speed 3,500-3,800
Torque Converter Series Nitrous Holeshot
Transmission TH400, TH350, TH375, TH375B, TH425
Transmission Model TH400, TH425, TH375, TH350
Warranty Time 12 Months

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B&M Nitrous HoleShot 3800 Torque Converter, 1965-91 GM TH400, TH425 TH375B, 1965-81 GM TH350 20485: