Superior Allison 1000 Shift Correction

Professional-grade shift correction package for the Allison 1000 series transmission in Duramax diesel trucks. This Superior kit addresses common valve body wear issues and improves shift quality, line pressure, and converter clutch engagement. Essential for any Allison rebuild or for correcting shift complaints in high-mileage trucks.

Compatible with 2001-2019 Chevrolet Silverado and GMC Sierra 2500HD and 3500HD. Includes detailed installation instructions. Proven to improve transmission durability and shift quality under heavy towing and daily driving conditions.