Specification
Description
The B&M Shift Improver Kit is designed to recalibrate your 1988-1994 GM TH400 and TH475 automatic transmissions, providing two performance options: - **Heavy Duty**: Delivers firm, positive shifts without compromising driver comfort, ideal for performance street driving or towing. - **Street/Strip**: Offers noticeably firm shifts, capable of chirping tires during aggressive driving, recommended for high-performance street or competitive use. This kit eliminates soft and sluggish shifts, reduces shift overlap, and extends transmission life. Installation is straightforward, requiring only basic hand tools. ([holley.com](https://www.holley.com/products/drivetrain/internal_components/parts/20261?utm_source=openai))
Disclaimer
This product is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles as it does not affect vehicle emissions and is not covered by emissions regulations. ([holley.com](https://www.holley.com/products/drivetrain/internal_components/parts/20261?utm_source=openai))