10L90 Transmission Upgrade

CDT 10L90 Bench Rebuild. You will need to ship your transmission to us for the rebuild.

• High-Performance overhaul kit engineered utilizing premium materials for racing
• Bonded OE Valve Body Plate 
• Bushing Kit 
• Pan Gasket
• Filter
• Delete Thermal Bypass if applicable 
• Raybestos GPZ Drop-In Clutch Module (no added clutch capacity)
  • For an additional charge, we can add clutch capacity in the E Clutch Pack and F Clutch Pack - by adding clutch capacity it results in a 10-20% extra holding capacity in that clutch pack.
• Valve-Body Calibration Options:
  • S1: Increases Line Pressure, Lube Flow, and Clutch Boost Oil
  • S2: Includes S1 and also increases TCC (Torque Converter Clutch) Apply

*$4,775 does not include any Hard Part damage, Torque Converter or TCM/ECM tuning. After an internal inspection of your transmission we will notify you of any hard part damage that will carry an additional cost. Normal range with available upgrades ranges from $5,000 - $6,000.

If your transmission has very low mileage, we may be able to do an upgrade which is less expensive than the rebuild - please call us to discuss.

Warranty varies according to application. Please refer to Warranty Info page on our website.

If you need assistance shipping your transmission, we can arrange Domestic Shipping (averages $200 - $300 each way) for your transmission. Please complete the Shipping Questionnaire if you would like us to arrange shipping.

We do not supply a TCM or ECM tune.

Flushing Cooler & Lines We cannot stress enough the importance of flushing the transmission cooler(s) and lines, even if they are new. We recommend using a Hot Flush Machine or something comparable.

Thank you for the opportunity to assist you.

Why use Circle D for your 10L90 transmission rebuild? The same reason why so many other horsepower junkies choose our services: because we’re an innovator and a leader in the transmission industry. Since 1976, we’ve been specializing in GM and Ford rear-wheel drive high performance transmissions. We pride ourselves on our ability to always stay at the top of our field by keeping up with current research, development, and technology.

We offer superior service because this isn’t just our business or our job—it’s our passion. Our team of knowledgeable experts is here to help you before you even submit your order for a 10L90 transmission rebuild and we’ll also be here to assist you once your purchase or repair is complete. We’ll get your horsepower to the pavement where it belongs, whether it’s for a custom show vehicle or street and strip.

Over the years, the Circle D business has evolved and grown. What started as a two bay shop expanded into a destination for Houston locals who needed transmission rebuilds and now we’re excited to provide high performance transmission parts and rebuild services for transmissions shipped to our shop.

With this full range of services, customers from all over the country can enjoy the same 10L90 performance rebuilds as our Houston neighbors. As a small, family-owned business, we’re humbled to know that our transmission rebuilds and parts are being used in vehicles both near and far. Get in touch today to learn more about our services or fill out our performance questionnaire to start the process.

Stay Safe and Have Fun!

The Crew at CDT