B&M Shift Improver Kit - GM TH400/475 Transmissions - 20261
SKU: 11139755172

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

Sale price$78.70 Regular price$87.45
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Ships within 48 hours · Estimated delivery Jul 7 - Jul 12

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Description

B&M Shift Improver Kit - GM TH400/475 Transmissions - 20261Overview: 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

Overview:

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

Application:

Year Make Model Submodel Engine Size
1988 Chevrolet R20 Custom Deluxe
1988 Chevrolet R20 Scottsdale
1988 Chevrolet R20 Silverado
1988 Chevrolet R20 Suburban
1989 Chevrolet R2500
1989 - 1990 Chevrolet R2500 Suburban
1988 Chevrolet R30
1989 - 1990 Chevrolet R3500
1990 Chevrolet V1500 Suburban
1988 Chevrolet V20 Suburban
1989 - 1990 Chevrolet V2500 Suburban
1988 Chevrolet V30
1989 - 1990 Chevrolet V3500
1988 - 1990 GMC C1500
1988 - 1990 GMC C2500
1988 - 1990 GMC C3500
1988 - 1990 GMC G1500
1988 - 1990 GMC G2500
1988 GMC G3500 Rally
1988 GMC G3500 Rally STX
1988 GMC G3500 Vandura
1988 GMC G3500 Rally Custom
1988 GMC G3500 Magnavan
1988 GMC G3500 Rally Camper Special
1988 GMC G3500 Vandura Special
1989 - 1990 GMC G3500
1988 - 1990 GMC Jimmy
1988 - 1990 GMC K1500
1988 - 1990 GMC K2500
1988 - 1990 GMC K3500
1988 - 1989 GMC P2500
1988 - 1990 GMC P3500
1990 GMC R1500 Suburban
1988 - 1989 GMC R2500
1988 - 1990 GMC R2500 Suburban
1988 - 1990 GMC R3500
1990 GMC V1500 Suburban
1988 - 1990 GMC V2500 Suburban
1988 - 1990 GMC V3500
1988 - 1990 Cadillac Brougham
1988 - 1990 Chevrolet Blazer
1990 Chevrolet C1500 Cheyenne
1990 Chevrolet C1500 Scottsdale
1990 Chevrolet C1500 Silverado
1990 Chevrolet C1500 454 SS
1990 Chevrolet C1500 WT
1988 - 1989 Chevrolet C1500
1988 - 1990 Chevrolet C2500
1988 - 1990 Chevrolet C3500
1988 - 1990 Chevrolet G10
1988 - 1990 Chevrolet G20
1988 - 1990 Chevrolet G30
1988 - 1990 Chevrolet K1500
1988 - 1990 Chevrolet K2500
1988 - 1990 Chevrolet K3500
1988 - 1989 Chevrolet P20
1988 - 1990 Chevrolet P30
1990 Chevrolet R1500 Suburban
1988 Chevrolet R20 Cheyenne

Specs:

Automotive Item Grade High Performance
Brand B&M
California Proposition 65 Chemical Name Cadmium and cadmium compounds
California Proposition 65 Required Yes
Emission Code 5
Gasket Included Yes
Instructions Included Yes
Product Type Automatic Transmission Valve Body Kit
Warning California Proposition 65
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 11139755172

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Omaha, US
★★★★★ 5
Elegant , lots of space
Color: 172-Black Stripe
Best wallet ever, I love it !!!!
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Reviewed in the United States on May 12, 2026
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CCMiami
Battle Creek, US
★★★★★ 3
Very large
Color: 172-Black Stripe
The quality is good but very large: wide and thick. Returned.
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Reviewed in the United States on May 24, 2026
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Rockin Roger
Natrona Heights, US
★★★★★ 5
Wallet This Wallet That
Color: Light Brown
I bought this wallet to replace my old wallet that was falling apart, and probably 10 years old and so I was due for one! This one looks great and is very functional with many compartments for credit cards and a special compartment for the my ID, and it also provides a protection thing that keeps people from stealing my credit card information and also has room for pictures and there are two large compartments for cash and other miscellaneous paper items. I love the light brown, real soft leather look of it and so far it is really durable and I love it. It was a good buy and priced really well!
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Manuela Rojas
Draper, US
★★★★★ 5
Should buy
Color: Black
Good material, enough card slots. Looks elegant. Great quality.
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Reviewed in the United States on May 28, 2026
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Amazon Customer
Draper, US
★★★★★ 5
Genuine leather wallet
Color: Brown
I like the wallet very much. It has plenty of room for my credit cards, ID cards and other items. Also plenty room for cash money. It’s well made and I expect it will last several years before needing replacement.
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Reviewed in the United States on June 1, 2026

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