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At Circle D Transmission, we understand that performance enthusiasts demand more from their vehicles, especially those equipped with the powerful and capable eight speed transmission like the 8L90. Since 1976, we’ve been leading the way in automatic transmissions innovation, specializing in custom modifications, precision input shaft upgrades, and billet components that work seamlessly with your torque converter. Many vehicle owners experience issues such as harsh shifting or overheating when the transmission fluid isn’t properly maintained, and our expertly manufactured parts and rebuild kits make a huge difference in both reliability and performance.
Whether you need a direct replacement or a kit designed for an easy install, our solutions ensure your 8L90 performs at its best. By replacing worn components with superior billet upgrades and precision‑engineered parts, your transmission can handle more power, smoother operation, and longer life. Every part we provide is carefully designed and manufactured for maximum durability, ensuring it can be confidently installed as a true performance replacement that transforms your driving experience.
Please select one of the options below for more information.
1. Chevrolet Corvette (C7 Z06) The C7 Corvette Z06 is already a performance icon with its supercharged 6.2L V8 engine. When paired with an upgraded 8L90 transmission, this sports car unleashes even more potential. With custom modifications, billet upgrades, and specialized clutch packs, your C7 Z06 can benefit from improved acceleration and track reliability. Whether for the drag strip or the road course, Circle D Transmission helps you achieve seamless, high-speed shifts that push the boundaries of your Corvette’s capabilities.
By replacing stock components with superior, precision‑manufactured parts, you ensure maximum durability under extreme conditions. This upgrade not only boosts performance but also provides vehicle owners with a direct replacement solution that’s engineered for an easy install and long‑term reliability.
2. Chevrolet Camaro SS Known for its raw muscle and high horsepower, the Camaro SS with its 8L90 transmission can be pushed even further with performance modifications. By opting for our performance rebuild, you can experience smoother gear transitions, reduced transmission slippage, and quicker shift response times. Enhanced durability means that even under the stress of high RPMs and heavy torque, your SS will maintain its edge without compromise.
With superior billet upgrades, precision input shaft enhancements, and optimized torque converter technology, Circle D Transmission delivers a huge difference in both reliability and performance. Our rebuild provides vehicle owners with a direct replacement kit that’s manufactured for an easy install, ensuring your Camaro is ready to handle the demands of both daily driving and competitive track use.
3. Cadillac Escalade V-Series The luxury of a Cadillac Escalade paired with the precision of an 8L90 transmission offers an unrivaled driving experience. However, if you’re looking to amplify power delivery and handling for more spirited driving or towing capability, our custom modifications are perfect for you. Our transmission upgrades ensure that your Escalade maintains the luxury ride you expect while delivering extra performance when you need it most.
With premium billet upgrades, optimized torque converter technology, and expertly manufactured replacement components, Circle D Transmission provides the durability and precision your Escalade deserves. These performance enhancements give vehicle owners a direct replacement kit that’s engineered for an easy install, making a huge difference in both towing capacity and high‑end driving performance.
4. GMC Sierra Denali 6.2L For truck enthusiasts who value both power and utility, upgrading the 8L90 transmission in your GMC Sierra Denali can transform your truck into an unstoppable force. With our heavy-duty transmission upgrades, including billet shafts and reinforced clutch packs, your Sierra gains enhanced towing capacity and stronger acceleration for off-road or worksite challenges. Trust Circle D Transmission to ensure that your Denali remains reliable even when pushed to its limits.
Our use of precision‑engineered torque converter enhancements, input shaft upgrades, and premium transmission fluid solutions makes a huge difference in both durability and performance. Designed as a direct replacement kit that’s manufactured for an easy install, these upgrades give vehicle owners the confidence to handle extreme loads without sacrificing ride quality or longevity.
5. Chevrolet Silverado High Country Owners of the Silverado High Country know the importance of performance and reliability. Our 8L90 upgrades cater to those who rely on their trucks for more than just daily driving. With custom performance transmission rebuilds and reinforced internals, your Silverado will gain improved low-end torque delivery and smoother shifts under load. Our transmission packages are designed to handle the demands of heavy towing and prolonged high-performance use.
By incorporating billet upgrades, advanced torque converter technology, and precision input shaft enhancements, Circle D Transmission provides a direct replacement kit that makes a huge difference in strength and durability. Each package is expertly manufactured for an easy install, giving vehicle owners superior performance and peace of mind whether on the worksite or open road.
6. Cadillac CTS-V This luxury sport sedan is known for its high output and refined engineering. By upgrading its 8L90 transmission, you can make the CTS-V even more formidable. Our billet upgrades and performance rebuilds ensure that power delivery remains consistent, even when pushed during spirited drives. With a focus on reliability and seamless power transfer, Circle D Transmission helps your CTS-V stay ahead of the competition.
Through precision‑engineered torque converter technology, input shaft enhancements, and premium transmission fluid solutions, we deliver a direct replacement kit that makes a huge difference in both daily driving and track performance. Each component is expertly manufactured for an easy install, giving vehicle owners superior durability and responsiveness under extreme horsepower conditions.
Why choose Circle D for your 8L90 transmission rebuild? The answer is simple: we’ll get the job done right. Our team specializes in Ford and GM rear-wheel drive high-performance transmissions.
Transmission rebuilds aren’t just our business—they’re also our passion. We love what we do and it shows in our service.
Circle D Transmission has expanded over the years, from our beginnings as a two-bay shop to becoming the go-to destination for Houston locals who need transmission rebuilds. These days, you’ll find our high-performance transmission parts and rebuild services for transmissions available worldwide.
As a small, family-owned business, we’re thrilled to know that our transmission rebuilds and parts are being used in vehicles near and far. Contact our team today to learn more about our 8L90 performance transmission rebuild services or submit our high-performance vehicle questionnaire to start the process.
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The Crew at CDT
Billet upgrades strengthen critical components such as the torque converter, input shaft, and clutch packs, providing superior durability under high horsepower and towing conditions. For 8L90 transmissions, billet parts significantly reduce the risk of harsh shifting, overheating, and premature wear, making a huge difference in both daily driving and competitive performance.
Many vehicle owners experience harsh shifting in their eight‑speed 8L90 due to transmission fluid breakdown or worn internal components. Circle D Transmission combats this issue with precision‑manufactured replacement kits, custom tuning, and reinforced clutch packs that ensure smoother gear transitions and reliable torque multiplication.
Yes. Our 8L90 rebuilds are designed as a direct replacement, ensuring an easy install while providing superior performance compared to stock clutches and components. Each kit is carefully manufactured to exceed OEM standards, giving vehicle owners confidence in both reliability and horsepower handling.
Our performance rebuilds make a huge difference for high‑performance and heavy‑duty vehicles such as the Chevrolet Corvette C7 Z06, Camaro SS, Cadillac CTS‑V, Escalade V‑Series, GMC Sierra Denali, and Chevrolet Silverado High Country. Whether for spirited driving, towing, or track use, these upgrades deliver balanced performance, superior durability, and longer transmission life.
Since 1976, Circle D Transmission has specialized in high‑performance automatic transmissions, offering unmatched expertise in billet upgrades, torque converter enhancements, and precision input shaft modifications. As a family‑owned business, we pride ourselves on delivering quality rebuilds that transform your driving experience, backed by decades of proven results in the transmission industry.
