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B&M Shift Improver Kit, GM TH400/475 Transmissions 20261

B&M Shift Improver Kit, GM TH400/475 Transmissions 20261
B&M Shift Improver Kit, GM TH400/475 Transmissions 20261
$90.99 ea
NEWARRIVING SOONEstimated Ship Date 06/11/2024 (If Ordered Today)14 Available from HOLLEY PERFORMANCE PRODUCTS as of 05/20/2024
Model: 3998140
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 1988-1994 GM TH400 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 Off-Road, Towing or Street/Strip Use
  • Eliminates Soft and Sluggish Shifts
  • Over 65 Years of B&M Quality
  • Eliminates Shift Overlap
  • Provides Crisp Shifts
  • Easy Installation
Fits 1988-1994 Chevrolet, Buick, Olds, Pontiac, GMC TH400 Automatic Transmissions.
Installation Notes:
Fits 1988-1994 Chevrolet, Buick, Olds, Pontiac, GMC TH400 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
20261_instructions.pdf2.74MB

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
Cadillac Brougham 1988 5.0L / 307 / V8
Cadillac Brougham 1989 5.0L / 307 / V8
Cadillac Brougham 1990 5.7L / 350 / V8
Chevrolet Blazer 1989 5.7L / 350 / V8
Chevrolet Blazer 1990 5.7L / 350 / V8
Chevrolet C1500 1989 5.0L / 305 / V8
Chevrolet C1500 1990 5.0L / 305 / V8
Chevrolet C2500 1989 5.7L / 350 / V8
Chevrolet C2500 1990 5.7L / 350 / V8
Chevrolet C3500 1989 7.4L / 454 / V8
Chevrolet C3500 1990 7.4L / 454 / V8
Chevrolet G10 1989 5.7L / 350 / V8
Chevrolet G10 1990 5.7L / 350 / V8
Chevrolet G20 1989 5.7L / 350 / V8
Chevrolet G20 1990 5.7L / 350 / V8
Chevrolet G30 1989 5.7L / 350 / V8
Chevrolet G30 1990 5.7L / 350 / V8
Chevrolet K1500 1989 5.7L / 350 / V8
Chevrolet K1500 1990 5.7L / 350 / V8
Chevrolet K2500 1989 5.7L / 350 / V8
Chevrolet K2500 1990 5.7L / 350 / V8
Chevrolet K3500 1989 5.7L / 350 / V8
Chevrolet K3500 1990 5.7L / 350 / V8
Chevrolet R1500 Suburban 1990 5.7L / 350 / V8
Chevrolet R2500 Suburban 1989 5.7L / 350 / V8
Chevrolet R2500 Suburban 1990 5.7L / 350 / V8
Chevrolet R2500 1989 5.7L / 350 / V8
Chevrolet R3500 1989 7.4L / 454 / V8
Chevrolet R3500 1990 7.4L / 454 / V8
Chevrolet V1500 Suburban 1990 5.7L / 350 / V8
Chevrolet V2500 Suburban 1989 5.7L / 350 / V8
Chevrolet V2500 Suburban 1990 5.7L / 350 / V8
Chevrolet V3500 1989 5.7L / 350 / V8
Chevrolet V3500 1990 5.7L / 350 / V8
GMC C1500 1988 5.7L / 350 / V8
GMC C1500 1989 5.7L / 350 / V8
GMC C1500 1990 5.7L / 350 / V8
GMC C2500 1988 5.7L / 350 / V8
GMC C2500 1989 5.7L / 350 / V8
GMC C2500 1990 5.7L / 350 / V8
GMC C3500 1988 7.4L / 454 / V8
GMC C3500 1989 7.4L / 454 / V8
GMC C3500 1990 7.4L / 454 / V8
GMC G1500 1988 5.7L / 350 / V8
GMC G1500 1989 5.7L / 350 / V8
GMC G1500 1990 5.7L / 350 / V8
GMC G2500 1988 5.7L / 350 / V8
GMC G2500 1989 5.7L / 350 / V8
GMC G2500 1990 5.7L / 350 / V8
GMC G3500 1988 5.7L / 350 / V8
GMC G3500 1989 5.7L / 350 / V8
GMC G3500 1990 5.7L / 350 / V8
GMC Jimmy 1988 5.7L / 350 / V8
GMC Jimmy 1989 5.7L / 350 / V8
GMC Jimmy 1990 5.7L / 350 / V8
GMC K1500 1988 5.7L / 350 / V8
GMC K1500 1989 5.7L / 350 / V8
GMC K1500 1990 5.7L / 350 / V8
GMC K2500 1988 5.7L / 350 / V8
GMC K2500 1989 5.7L / 350 / V8
GMC K2500 1990 5.7L / 350 / V8
GMC K3500 1988
GMC K3500 1989
GMC K3500 1990
GMC R1500 Suburban 1990
GMC R2500 Suburban 1988
GMC R2500 Suburban 1989
GMC R2500 Suburban 1990
GMC R2500 1988
GMC R2500 1989
GMC R3500 1988
GMC R3500 1989
GMC R3500 1990
GMC V1500 Suburban 1990
GMC V2500 Suburban 1988
GMC V2500 Suburban 1989
GMC V2500 Suburban 1990
GMC V3500 1988
GMC V3500 1989
GMC V3500 1990

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
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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