B&M Shift Improver Kit - GM TH400/475 Transmissions
£67.00 GBP£75.00 GBP
Speedzone SKU:
BBFT_20261
Manufacturer part number:
20261
Specifications
- Brand
- B&M
- UPC
- 00019695202613
- Category
- Automatic Transmission Shift Kit
- Shipping weight
- 0.9 lb
- EPA
- N
Item is in stockHurry! Low inventoryItem is out of stock
Item is unavailable
Speedzone Performance LLC
Financing available
Split this into smaller payments — lease-to-own and buy now, pay later
Links open in a new tab; return here to finish shopping. Select Klarna, Shop Pay or Sezzle to learn how they work before checkout. Eligibility applies.
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.
Manufacturer installation notes
Fits 1988-1994 Chevrolet, Buick, Olds, Pontiac, GMC TH400 Automatic Transmissions.
Manufacturer-listed applications
Match the engine, body, trim and installation requirements. All qualifications shown for an application apply together. Where this part requires a modified or aftermarket assembly, the vehicle listing alone does not confirm compatibility with factory equipment.
| Vehicle | Configuration and qualifications |
|---|---|
| 1988–1989 Cadillac Brougham | Engine: 5.0L V8 Quantity: 1 Submodel: d'Elegance Engine displacement (cu in): 307 Transmission code: THM400 |
| 1988–1989 Cadillac Brougham | Engine: 5.0L V8 Quantity: 1 Submodel: Base Engine displacement (cu in): 307 Transmission code: THM400 |
| 1990 Cadillac Brougham | Engine: 5.7L V8 Quantity: 1 Submodel: d'Elegance Engine displacement (cu in): 350 Transmission code: THM400 |
| 1990 Cadillac Brougham 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 GMC Jimmy |
Engine: 5.7L V8 Quantity: 1 Submodel: Base Engine displacement (cu in): 350 Transmission code: THM400 |
| 1989–1990 Chevrolet Blazer 1989–1990 Chevrolet C2500 1989–1990 Chevrolet K1500 1989–1990 Chevrolet K2500 1989–1990 Chevrolet K3500 1990 Chevrolet R1500 Suburban 1989–1990 Chevrolet R2500 Suburban 1990 Chevrolet V1500 Suburban 1989–1990 Chevrolet V2500 Suburban 1989–1990 Chevrolet V3500 |
Engine: 5.7L V8 Quantity: 1 Submodel: Scottsdale Engine displacement (cu in): 350 Transmission code: THM400 |
| 1989–1990 Chevrolet Blazer 1989–1990 Chevrolet C2500 1989–1990 Chevrolet K1500 1989–1990 Chevrolet K2500 1989–1990 Chevrolet K3500 1990 Chevrolet R1500 Suburban 1989 Chevrolet R2500 1989–1990 Chevrolet R2500 Suburban 1990 Chevrolet V1500 Suburban 1989–1990 Chevrolet V2500 Suburban 1989–1990 Chevrolet V3500 |
Engine: 5.7L V8 Quantity: 1 Submodel: Silverado Engine displacement (cu in): 350 Transmission code: THM400 |
| 1989–1990 Chevrolet C1500 | Engine: 5.0L V8 Quantity: 1 Submodel: Silverado Engine displacement (cu in): 305 Transmission code: THM400 |
| 1989–1990 Chevrolet C1500 | Engine: 5.0L V8 Quantity: 1 Submodel: Cheyenne Engine displacement (cu in): 305 Transmission code: THM400 |
| 1989–1990 Chevrolet C1500 | Engine: 5.0L V8 Quantity: 1 Submodel: Scottsdale Engine displacement (cu in): 305 Transmission code: THM400 |
| 1990 Chevrolet C1500 | Engine: 5.0L V8 Quantity: 1 Submodel: WT Engine displacement (cu in): 305 Transmission code: THM400 |
| 1989–1990 Chevrolet C2500 1989–1990 Chevrolet K1500 1989–1990 Chevrolet K2500 1989–1990 Chevrolet K3500 1989–1990 Chevrolet V3500 |
Engine: 5.7L V8 Quantity: 1 Submodel: Cheyenne Engine displacement (cu in): 350 Transmission code: THM400 |
| 1989–1990 Chevrolet C2500 | Engine: 5.7L V8 Quantity: 1 Submodel: Base Engine displacement (cu in): 350 Application notes: THM400 |
| 1989–1990 Chevrolet C3500 1989–1990 Chevrolet R3500 |
Engine: 7.4L V8 Quantity: 1 Submodel: Silverado Engine displacement (cu in): 454 Transmission code: THM400 |
| 1989–1990 Chevrolet C3500 1989–1990 Chevrolet R3500 |
Engine: 7.4L V8 Quantity: 1 Submodel: Scottsdale Engine displacement (cu in): 454 Transmission code: THM400 |
| 1989–1990 Chevrolet C3500 1989–1990 Chevrolet R3500 |
Engine: 7.4L V8 Quantity: 1 Submodel: Cheyenne Engine displacement (cu in): 454 Transmission code: THM400 |
| 1989–1990 Chevrolet G10 1989–1990 Chevrolet G20 1989–1990 Chevrolet G30 |
Engine: 5.7L V8 Quantity: 1 Submodel: Sportvan Engine displacement (cu in): 350 Transmission code: THM400 |
| 1989–1990 Chevrolet G20 1989–1990 Chevrolet G30 |
Engine: 5.7L V8 Quantity: 1 Submodel: Beauville Engine displacement (cu in): 350 Transmission code: THM400 |
| 1989–1990 Chevrolet G20 1989–1990 Chevrolet G30 |
Engine: 5.7L V8 Quantity: 1 Submodel: Chevy Van Engine displacement (cu in): 350 Transmission code: THM400 |
| 1989–1990 Chevrolet G30 | Engine: 5.7L V8 Quantity: 1 Submodel: Hi-Cube Engine displacement (cu in): 350 Transmission code: THM400 |
| 1990 Chevrolet K1500 | Engine: 5.7L V8 Quantity: 1 Submodel: WT Engine displacement (cu in): 350 Transmission code: THM400 |
| 1988–1990 GMC C1500 1988–1990 GMC C2500 1988–1990 GMC K1500 1988–1990 GMC K2500 1988–1990 GMC K3500 |
Engine: 5.7L V8 Quantity: 1 Submodel: Sierra SLE Engine displacement (cu in): 350 Transmission code: THM400 |
| 1988–1990 GMC C1500 1988–1990 GMC C2500 1988–1990 GMC K1500 1988–1990 GMC K2500 1988–1990 GMC K3500 |
Engine: 5.7L V8 Quantity: 1 Submodel: Sierra Engine displacement (cu in): 350 Transmission code: THM400 |
| 1988–1990 GMC C1500 1988–1990 GMC C2500 1988–1990 GMC K1500 1988–1990 GMC K2500 1988–1990 GMC K3500 |
Engine: 5.7L V8 Quantity: 1 Submodel: Sierra SLX Engine displacement (cu in): 350 Transmission code: THM400 |
| 1988–1990 GMC C3500 1988–1990 GMC K3500 |
Engine: 7.4L V8 Quantity: 1 Submodel: Sierra SLE Engine displacement (cu in): 454 Transmission code: THM400 |
| 1988–1990 GMC C3500 1988–1990 GMC K3500 |
Engine: 7.4L V8 Quantity: 1 Submodel: Sierra Engine displacement (cu in): 454 Transmission code: THM400 |
| 1988–1990 GMC C3500 1988–1990 GMC K3500 |
Engine: 7.4L V8 Quantity: 1 Submodel: Sierra SLX Engine displacement (cu in): 454 Transmission code: THM400 |
| 1988–1990 GMC K3500 | Engine: 6.2L V8 Quantity: 1 Submodel: Sierra SLX Engine displacement (cu in): 379 Transmission code: THM400 |
| 1988–1990 GMC K3500 | Engine: 6.2L V8 Quantity: 1 Submodel: Sierra Engine displacement (cu in): 379 Transmission code: THM400 |
| 1988–1990 GMC K3500 | Engine: 6.2L V8 Quantity: 1 Submodel: Sierra SLE Engine displacement (cu in): 379 Transmission code: THM400 |
| 1990 GMC R1500 Suburban 1990 GMC R2500 Suburban 1990 GMC R3500 1990 GMC V1500 Suburban 1990 GMC V2500 Suburban 1990 GMC V3500 |
Engine: 5.7L V8 Quantity: 1 Submodel: SLE Engine displacement (cu in): 350 Transmission code: THM400 |
| 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 |
Engine: 6.2L V8 Quantity: 1 Submodel: Base Engine displacement (cu in): 379 Transmission code: THM400 |
| 1990 GMC R1500 Suburban 1990 GMC R2500 Suburban 1990 GMC R3500 1990 GMC V1500 Suburban 1990 GMC V2500 Suburban 1990 GMC V3500 |
Engine: 6.2L V8 Quantity: 1 Submodel: SLE Engine displacement (cu in): 379 Transmission code: THM400 |
| 1988–1989 GMC R2500 1988–1989 GMC R2500 Suburban 1988–1989 GMC R3500 1988–1989 GMC V2500 Suburban 1988–1989 GMC V3500 |
Engine: 6.2L V8 Quantity: 1 Submodel: Sierra Classic Engine displacement (cu in): 379 Transmission code: THM400 |
| 1988–1989 GMC R2500 1988–1989 GMC R3500 1988–1989 GMC V3500 |
Engine: 7.4L V8 Quantity: 1 Submodel: High Sierra Engine displacement (cu in): 454 Transmission code: THM400 |
| 1988–1989 GMC R2500 1988–1989 GMC R3500 1988–1989 GMC V3500 |
Engine: 5.7L V8 Quantity: 1 Submodel: High Sierra Engine displacement (cu in): 350 Transmission code: THM400 |
| 1988–1989 GMC R2500 1988–1989 GMC R3500 1988–1989 GMC V3500 |
Engine: 6.2L V8 Quantity: 1 Submodel: High Sierra Engine displacement (cu in): 379 Transmission code: THM400 |
| 1988–1989 GMC R2500 1988–1990 GMC R2500 Suburban 1988–1990 GMC R3500 1988–1990 GMC V3500 |
Engine: 7.4L V8 Quantity: 1 Submodel: Base Engine displacement (cu in): 454 Transmission code: THM400 |
| 1988–1989 GMC R2500 1988–1989 GMC R2500 Suburban 1988–1989 GMC R3500 1988–1989 GMC V2500 Suburban 1988–1989 GMC V3500 1988–1990 GMC Jimmy |
Engine: 5.7L V8 Quantity: 1 Submodel: Sierra Classic Engine displacement (cu in): 350 Transmission code: THM400 |
| 1988–1989 GMC R2500 1988–1989 GMC R2500 Suburban 1988–1989 GMC R3500 1988–1989 GMC V3500 |
Engine: 7.4L V8 Quantity: 1 Submodel: Sierra Classic Engine displacement (cu in): 454 Transmission code: THM400 |
| 1988 GMC R2500 1988 GMC R3500 1988 GMC V3500 |
Engine: 4.8L inline-6 Quantity: 1 Submodel: High Sierra Engine displacement (cu in): 292 Transmission code: THM400 |
| 1988 GMC R2500 1988 GMC R3500 1988 GMC V3500 |
Engine: 4.8L inline-6 Quantity: 1 Submodel: Sierra Classic Engine displacement (cu in): 292 Transmission code: THM400 |
| 1988 GMC R2500 1988 GMC R3500 1988 GMC V3500 |
Engine: 4.8L inline-6 Quantity: 1 Submodel: Base Engine displacement (cu in): 292 Transmission code: THM400 |
| 1990 GMC R2500 Suburban 1990 GMC R3500 1990 GMC V3500 |
Engine: 7.4L V8 Quantity: 1 Submodel: SLE Engine displacement (cu in): 454 Transmission code: THM400 |
| 1988–1990 GMC G1500 1988–1990 GMC G2500 1988–1990 GMC G3500 |
Engine: 5.7L V8 Quantity: 1 Submodel: Rally STX Engine displacement (cu in): 350 Transmission code: THM400 |
| 1988–1990 GMC G1500 1988–1990 GMC G2500 1988–1990 GMC G3500 |
Engine: 5.7L V8 Quantity: 1 Submodel: Rally Engine displacement (cu in): 350 Transmission code: THM400 |
| 1988–1990 GMC G2500 1988–1990 GMC G3500 |
Engine: 5.7L V8 Quantity: 1 Submodel: Vandura Engine displacement (cu in): 350 Transmission code: THM400 |
| 1988–1990 GMC G3500 | Engine: 5.7L V8 Quantity: 1 Submodel: Vandura Special Engine displacement (cu in): 350 Transmission code: THM400 |
| 1988–1990 GMC G3500 | Engine: 5.7L V8 Quantity: 1 Submodel: Magnavan Engine displacement (cu in): 350 Transmission code: THM400 |
| 1988–1990 GMC G3500 | Engine: 5.7L V8 Quantity: 1 Submodel: Rally Camper Special Engine displacement (cu in): 350 Transmission code: THM400 |
| 1988 GMC G3500 | Engine: 5.7L V8 Quantity: 1 Submodel: Rally Custom Engine displacement (cu in): 350 Transmission code: THM400 |
Full details on shipping times, returns, warranty and cancellations are on our policy page.
Market conditions after 2020 have changed the landscape of automotive parts. Although we stock thousands of items across multiple warehouses and distribution channels, back-orders are unavoidable in today's market. If you need a product quickly, email, message or call us to check availability so we can explore your options.
Email Sales@Speedzoneweb.com
Call 407-846-8430
Text 407-749-6314
Answers to common questions are on our FAQ page.
Under the Influence by Speedzone
Product approval required
Want to promote this product?
Approved Speedzone creators can request access to promote this item.
Request to Promote This Product
Parts Financing
Product Request
Return Policy
Wheel & Tire Builder
Discount Codes
