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B&M Shift Improver Kit, GM TH400 Transmissions 20260

B&M Shift Improver Kit, GM TH400 Transmissions 20260
B&M Shift Improver Kit, GM TH400 Transmissions 20260
$90.99 ea
NEWARRIVING SOONEstimated Ship Date 06/04/2024 (If Ordered Today)13 Available from HOLLEY PERFORMANCE PRODUCTS as of 05/13/2024
Model: 3998139
Select a Vehicle or refer to the Vehicle Fitment Tab below to verify that this part fits your vehicle.
STANDARD
DELIVERY
The B&M® Shift Improver kits™ feature two options to recalibrating your 1965-1987 GM TH400, TH375 and TH475 automatic transmissions. First is the HEAVY DUTY set-up, giving you firm positive shifts without loss of driver comfort for improved performance in all street vehicles. This is a great option for performance street driving or towing. The second is our STREET/STRIP set-up. Be warned, this will deliver firm positive shifts you will feel, along with easily chirping the tires when shifting somewhat aggressively. This setting is recommend for high performance street/strip use, or for competitive events when you want the hardest, quickest shifts possible from a shift improver kit.
Features:
  • Perfect for Towing or Street/Strip Use
  • Eliminates Soft and Sluggish Shift
  • Recalibrates Stock Transmissions
  • Over 65 Years of B&M Quality
  • Eliminates Shift Overlap
  • Provides Crisp Shifts
Fits 1965 to 1987 GM Turbo-Hydramatic 400, Turbo-Hydramatic 375 and 475 automatic transmissions
Installation Notes:
Fits 1965 to 1987 GM Turbo-Hydramatic 400, Turbo-Hydramatic 375 and 475 automatic transmissions

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
bm_warranty.pdf87.47KB
20260_instructions.pdf3.03MB

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 Years Engine
Buick Skylark 1965 6.6L / 401 / V8
Buick Skylark 1966 6.6L / 401 / V8
Buick Skylark 1967 5.6L / 340 / V8
Buick Skylark 1969 5.7L / 350 / V8
Buick Special 1965 4.9L / 300 / V8
Buick Special 1966 5.6L / 340 / V8
Buick Special 1967 4.9L / 300 / V8
Buick Sportwagon 1966 5.6L / 340 / V8
Buick Sportwagon 1967 5.6L / 340 / V8
Buick Sportwagon 1968 5.7L / 350 / V8
Buick Sportwagon 1969 5.7L / 350 / V8
Chevrolet Chevelle 1966 6.5L / 396 / V8
Chevrolet Chevelle 1970 5.7L / 350 / V8
Chevrolet Chevelle 1971 5.7L / 350 / V8
Chevrolet Chevelle 1972 5.7L / 350 / V8
Chevrolet El Camino 1965 5.3L / 327 / V8
Chevrolet El Camino 1966 4.6L / 283 / V8
Chevrolet El Camino 1967 6.5L / 396 / V8
Chevrolet El Camino 1968 5.7L / 350 / V8
Chevrolet El Camino 1969 5.7L / 350 / V8
Chevrolet El Camino 1970 5.7L / 350 / V8
Chevrolet El Camino 1971 5.7L / 350 / V8
Chevrolet El Camino 1972 5.7L / 350 / V8
Chevrolet El Camino 1973 5.7L / 350 / V8
Chevrolet El Camino 1974 5.7L / 350 / V8
Chevrolet El Camino 1975 5.7L / 350 / V8
Chevrolet Laguna 1975 5.7L / 350 / V8
Chevrolet Malibu 1973 5.0L / 307 / V8
Chevrolet Malibu 1974 7.4L / 454 / V8
Chevrolet Malibu 1975 5.7L / 350 / V8
Oldsmobile Cutlass 1968
Oldsmobile Cutlass 1969
Oldsmobile Cutlass 1970
Oldsmobile Cutlass 1971
Oldsmobile Cutlass 1972
Oldsmobile Cutlass 1973
Oldsmobile Cutlass 1974
Oldsmobile Cutlass 1975
Oldsmobile F85 1965
Oldsmobile F85 1966
Oldsmobile F85 1968
Oldsmobile F85 1969
Oldsmobile F85 1970
Oldsmobile F85 1971
Oldsmobile F85 1972
Oldsmobile Vista Cruiser 1968
Oldsmobile Vista Cruiser 1969
Oldsmobile Vista Cruiser 1970
Oldsmobile Vista Cruiser 1971
Oldsmobile Vista Cruiser 1972
Oldsmobile Vista Cruiser 1973
Oldsmobile Vista Cruiser 1974
Oldsmobile Vista Cruiser 1975
Pontiac GTO 1966 6.4L / 389 / V8
Pontiac GTO 1967
Pontiac GTO 1968
Pontiac GTO 1969
Pontiac GTO 1970
Pontiac GTO 1971
Pontiac GTO 1972
Pontiac GTO 1973
Pontiac Grand Prix 1965
Pontiac Grand Prix 1966
Pontiac Grand Prix 1967
Pontiac Grand Prix 1968
Pontiac Grand Prix 1969
Pontiac Grand Prix 1970
Pontiac Grand Prix 1971
Pontiac Grand Prix 1972
Pontiac Grand Prix 1973
Pontiac Grand Prix 1974
Pontiac Grand Prix 1976
Pontiac Grand Prix 1977
Pontiac LeMans 1965
Pontiac LeMans 1968
Pontiac LeMans 1969
Pontiac LeMans 1970
Pontiac LeMans 1971
Pontiac LeMans 1972
Pontiac LeMans 1973
Pontiac LeMans 1974
Pontiac LeMans 1975
Pontiac LeMans 1976
Pontiac LeMans 1977
Pontiac Tempest 1965
Pontiac Tempest 1970

Specifications:

Automotive Item Grade High Performance
California Proposition 65 Chemical Name Cadmium and cadmium compounds
California Proposition 65 Required Yes
Emission Code 5
Gasket Included Yes
Instructions Included Yes
Manual Control No
Part Type Automatic Transmission Shift Kit
Product Type Automatic Transmission Valve Body Kit
Proposition 65 www.P65Warnings.ca.gov
Warranty Time 12 Months

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