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When it’s time to restore or upgrade your 8L90 transmission, Circle D’s premium rebuild kit delivers the performance, durability, and precision your vehicle demands. Designed for high-powered GM applications, this product includes everything a builder or transmission shop needs to complete a full overhaul, from metal clad seals and o-rings to gaskets, sealing rings, and performance-focused steel plates.
Whether you’re working on a performance build or simply bringing life back to a worn automatic transmission, this rebuild kit gives you access to a trusted brand that emphasizes both quality and fitment. Available in Level 2 or Level 3, it’s an excellent solution for drivers who demand more from their drivetrain and want all the seals and components required for a complete, professional rebuild.
Every 8L90 transmission rebuild kit includes a full overhaul kit that meets or exceeds OEM standards. From the smallest o-ring to high-capacity steel plates, this kit is engineered for compatibility, reliability, and long-lasting performance. Each product is carefully packaged and shipped free via UPS Ground within the contiguous U.S., helping you finish your project on time without surprise delays.
Circle D also gives you options to customize your rebuild with add-ons like the ATSG Rebuild Manual, signal accumulator piston kit, and sealing ring upgrades. Whether you’re a seasoned rebuilder or working in a pro-level transmission shop, these extras ensure your installation process is smooth and your results are built to last.
Each kit includes all essential components for a complete overhaul including metal clad seals, o-rings, gaskets, steel plates, and sealing rings, giving you everything needed to restore your 8L90 to peak performance.
Yes, the kit is designed to fit a wide range of GM vehicles equipped with the 8L90 automatic transmission, ensuring a proper match across multiple model years and drivetrains.
While professionals will find the kit ideal for shop use, experienced DIYers can also use this product, especially with the help of the optional ATSG rebuild manual for detailed step-by-step instructions.
Circle D’s 8L90 rebuild kit uses performance-rated components from premium brands, including enhanced steel plates and friction materials designed to exceed factory durability and responsiveness.
Shipping is free to the continental U.S. via UPS Ground, and most orders are processed quickly so that you can begin your transmission overhaul without delay.
