NEW! GM 6L45-6L90 Zip Kit

Target the root cause of multiple shift problems in GM 6L45, 6L50, 6L80 and 6L90 units with the all-new Sonnax Zip Kit 6L45-6L90-ZIP. Containing the perfect combination of uniquely designed parts, this easy-to-install kit will effectively seal critical pressure circuit losses to resolve these issues and get your vehicle back on the road fast.

  • Quick, hassle-free installation with no special tools or reaming required
  • Includes detailed tech booklet with in-depth rebuild and inspection tips for comprehensive valve body repair