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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
$93.99 ea
NEWARRIVING SOONEstimated Ship Date 12/10/2024 (If Ordered Today)100 Available from HOLLEY PERFORMANCE PRODUCTS as of 11/22/2024
Model: 3998139
Select a Vehicle or refer to the Vehicle Fitment Tab below to verify that this part fits your vehicle.
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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
Chevrolet Chevy II 1966 5.3L / 327 / V8
Chevrolet Chevy II 1967 5.3L / 327 / V8
Chevrolet Nova 1969 5.0L / 307 / V8
Chevrolet Nova 1970 5.0L / 307 / V8
Chevrolet Nova 1971 5.0L / 307 / V8
Chevrolet Nova 1972 5.0L / 307 / V8
Chevrolet Nova 1973 5.0L / 307 / V8
Chevrolet Nova 1974 5.7L / 350 / V8
Chevrolet Nova 1975 5.7L / 350 / V8

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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B&M Shift Improver Kit, GM TH400 Transmissions 20260:
Classic Nova 2024