We offer a comprehensive selection of high-quality drivetrain components and performance parts for both diesel and gas vehicles. We specialize in designing and manufacturing our own SunCoast-built transmissions, torque converters, and related components—all engineered for superior durability, efficiency, and power handling.
In addition to our in-house products, we provide a curated range of aftermarket parts and accessories from many of the industry’s most trusted brands. From transmission upgrades and CARB-compliant calibration options to supporting components that enhance vehicle performance, we offer everything you need to build, maintain, and maximize your truck or car’s potential.
You can easily access installation and product guides right from our website. Simply scroll to the bottom of any page and click the “Install Instructions” link in the footer to view or download our available guides.
Additionally, many individual product pages include direct links to their specific installation instructions. These downloadable files can be read online or printed for convenient reference during installation.
If the installation instructions you need are not available online, please call SCCI Tech Support at 1-800-868-0053 for assistance. Our team will be happy to help provide the correct documentation or technical guidance for your product.
Finding the correct transmission or torque converter for your vehicle is easy. You can browse our product categories and use the filter options to narrow down parts that fit your specific make, model, and drivetrain setup.
Each product page also includes detailed fitment information, so you can confirm compatibility before purchasing.
If you’d like personalized assistance, our team is always here to help — you can call or email us directly for expert guidance. You can also use the “Locate a Dealer” link on our website to find a trusted local dealer who can help identify and install the right components for your vehicle.
We offer several build levels for transmissions, often labeled as Category 1 through Category 5 (and specialty series like Guardian or Ranger). These designations indicate the level of performance upgrades and the horsepower/torque the transmission can handle.
For example, a Category 1 build is rated around 450 HP, whereas a Category 3 build is rated for roughly 600 HP (higher categories generally include more billet internal parts and clutch upgrades). A higher category number means the transmission is built to withstand more power or severe use (such as racing or heavy towing).
The Guardian series is typically a heavy-duty OEM+ style rebuild (an upgraded replacement for stock applications), while the higher “Category” builds (Cat 3, Cat 4, etc.) are aimed at extreme performance or competition use.
When selecting a transmission, choose the category that matches your engine’s output and your intended usage for optimal results and longevity.
No, SunCoast transmissions do not require any custom tuning or calibration to operate correctly. Each unit is designed and built to function properly with factory transmission programming right out of the box.
For customers with 68RFE transmissions, it’s important to note that our valve bodies are already modified to increase overall line pressure. Because of this, the factory transmission tuning must be retained for proper operation and reliability.
If you’re planning additional engine or transmission tuning, we recommend reaching out to our technical support team or your sales representative before making changes. They can provide expert guidance to ensure your setup performs safely and efficiently with your SunCoast transmission.
We recommend following a maintenance schedule based on how your vehicle is used rather than strictly adhering to the OEM interval. For most applications, servicing your transmission every 30,000 to 50,000 miles helps ensure long-term reliability and consistent performance.
If your vehicle is used for frequent towing, heavy hauling, or other demanding conditions, we suggest performing maintenance on the shorter end of that range, or even more often if the transmission sees routine high-load or high-heat situations.
Regular fluid and filter changes are the best way to protect your investment and keep your SunCoast transmission performing at its best.
We ship orders using trusted, major carriers including UPS, FedEx, and USPS, which you can select during checkout based on your preferred service and delivery speed.
For larger orders or transmissions that require special handling, we also partner with freight carriers to ensure safe and secure delivery. Freight shipments are arranged to provide the best balance of cost, reliability, and protection for your products.
If you prefer, you’re also welcome to arrange your own shipping through a carrier of your choice—whether it’s UPS, FedEx, USPS, or a freight company. Simply contact our team prior to shipment to coordinate pickup details and ensure a smooth delivery process.
Yes! We regularly offer free shipping and other special promotions throughout the year. These offers may be automatically applied at checkout or redeemed using a discount code provided during the promotion period.
We recommend checking our homepage or social media channels for the latest deals and shipping offers so you never miss a chance to save.
Yes, we can accommodate international orders. Because shipping rates and carrier options vary by destination, we ask that you contact us directly for assistance with placing an international order. Our team will be happy to provide a custom shipping quote and help arrange the best delivery method for your location.
SunCoast Performance strives to process and ship all in-stock orders promptly, typically within 1–3 business days.
If an item is backordered, built to order, or delayed for any reason, our team will notify you with an estimated ship date as soon as possible.
Please note that during peak seasons or promotional events, processing times may be slightly longer due to higher order volumes — but we always work to get your products shipped as quickly as possible.
Yes! You can find your tracking number listed in the top right corner of your invoice, which is emailed to you after your order is processed.
If you need assistance or have questions about your shipment, our team is happy to help. You can reach us at:
To return a product, we require a Return Merchandise Authorization (RMA) before sending any items back. All returns must be in original condition and packaging to be eligible for a refund.
Please note that restocking fees may apply to returned items unless the return is due to an error on our part. Additionally, special-order, custom-built, or used products are not eligible for return.
Returns must be completed within 30 days of the original purchase date. Returns received after 30 days may be subject to a late fee or may no longer qualify for a refund, depending on the condition and timing of the return.
For complete and up to date return information, please visit our official Return Policy page.
To obtain a Return Merchandise Authorization (RMA) number, please contact SunCoast Performance before sending back any product, core, or warranty item. Our team will review your request, confirm eligibility, and issue an RMA number along with specific return instructions.
You can request an RMA by:
Be sure to have your invoice number, part number, and reason for return ready when you reach out—this helps us process your RMA quickly and accurately.
Customers are generally responsible for return shipping costs. We do not provide prepaid return labels unless specifically authorized by our team, and shipping charges are non-refundable.
Refunds are issued for the purchase price of the returned item, minus any applicable restocking fees, once the product has been received and inspected.
Many SunCoast Performance products, such as transmissions and torque converters, include a refundable core charge. This deposit is refunded when you return your original core unit that matches your purchase (same model and part number) and is in rebuildable condition.
To qualify for a core refund:
Incomplete or damaged cores — for example, those missing components, containing fluid, or improperly packaged, may result in partial credit or denial of refund.
Once your core is received and inspected, refunds are typically processed within 20 business days to your original payment method.
For complete instructions and deduction details, please visit our official Core Return Policy page.
Once your core return is received and approved upon inspection, we will issue a refund to your original payment method for the eligible amount.
If your return relates to a warranty claim, any applicable credits or replacements will be processed after the product has been evaluated and approved by our technical team.
For questions or updates regarding your core or warranty credit, please contact our customer service team — we’re happy to help ensure your return or claim is handled promptly.
If you believe you’ve received a defective SunCoast product, please contact us before returning it to obtain a Return Merchandise Authorization (RMA). This helps ensure your return is properly tracked and processed.
Once authorized, you’ll need to:
All returned parts are evaluated by our technical team. If a defect in materials or workmanship is confirmed, the part will be repaired or replaced in accordance with our warranty policy.
For assistance or to request an RMA, please contact the Warranty Department at:
Yes, absolutely! We understand that paying a core charge upfront can be an added expense, so we’re happy to accommodate customers who prefer to send in their cores first.
If you choose this option, the core charge will be waived once your core is received and confirmed to be in acceptable, rebuildable condition. This means the unit must be complete, free of excessive damage, and able to rotate freely.
To arrange an upfront core return, please contact our team before placing your order so we can provide shipping instructions and ensure your build is processed smoothly.
You can conveniently place an order online 24/7 at suncoastdiesel.com. Simply browse our catalog, add your items to the cart, and complete checkout securely through our online store.
If you prefer to order by phone, you can also call us at 1-800-868-0053 during business hours (Monday–Thursday, 8am–5pm CST). Our team will be happy to assist you with product selection, fitment questions, or completing your purchase.
We accept all major credit cards and PayPal for convenient and secure online checkout. All credit card transactions are SSL-encrypted and processed through trusted, secure payment gateways to ensure your information is fully protected.
Please note that a 3% processing fee applies to all credit card transactions.
For added flexibility, financing options are also available on qualified purchases through partners such as Affirm, allowing you to split your purchase into easy monthly payments.
Yes, ordering from our website is completely secure. All order and payment information is encrypted using advanced SSL technology to ensure your personal data and payment details are fully protected.
If you prefer not to enter payment details online, you can also place your order by phone, and one of our team members will securely process your payment.
For every order, you’ll receive an email confirmation with your order details for your records.
Orders can be modified or canceled only before they have shipped. If you need to make a change, please contact us immediately — the fastest way to ensure your request is processed in time is by calling us directly.
Please note that email requests may experience a delay, so calling is strongly recommended for urgent order changes or cancellations. Once an order has shipped, our standard return policy will apply.
You can easily access installation and product guides right from our website. Simply scroll to the bottom of any page and click the “Install Instructions” link in the footer to view or download our available guides.
Additionally, many individual product pages include direct links to their specific installation instructions. These downloadable files can be read online or printed for convenient reference during installation.
If the installation instructions you need are not available online, please call SCCI Tech Support at 1-800-868-0053 for assistance. Our team will be happy to help provide the correct documentation or technical guidance for your product.
Our technical support team is here to help with any product or installation questions. You can submit a technical inquiry through our website contact form or by email, and our team typically responds within 1–2 business days.
For urgent issues, please call our Technical Support directly at 1-800-868-0053 for faster assistance.
To help us diagnose and resolve your issue quickly, please have the following ready:
While SunCoast Performance does not offer on-site installation training, we occasionally host technical sessions and R&D days that provide valuable hands-on learning opportunities and product insights.
In general, our products should be installed by a qualified transmission technician who follows the provided installation instructions to ensure proper performance and warranty coverage.
All SunCoast Performance products are backed by strong, industry-leading warranties designed to give you confidence in your purchase.
Note: Warranty terms and coverage are subject to change at any time. For the most accurate and up-to-date information, please visit our Warranty Registration page for complete details.
Torque Converters:
Transmissions (Including Converter Assemblies):
SunCoast Performance warranties are designed to protect you against defects in materials and workmanship on eligible products. Each product is backed by a limited parts warranty, ensuring you receive dependable performance and lasting quality.
What’s Covered:
What’s Not Covered:
Important Notes:
For full details or to initiate a claim, please contact SunCoast Performance at info@suncoastconverters.com
No. Our warranties cover parts only during the warranty period. Labor, shipping, fluids, filters, and other incidental costs are the responsibility of the customer unless otherwise stated in writing by SunCoast.
If a warranty issue occurs, we will repair or replace the defective part in accordance with the warranty terms, but labor reimbursement is not included.
For full details, please review the applicable SunCoast Warranty Policy or contact our Warranty Department at info@suncoastconverters.com
To activate your SunCoast Performance warranty, you must complete and submit a Warranty Registration Form after purchase.
You can register your warranty by filling out the warranty form included with your product or downloading it from suncoastdiesel.com
Information required includes:
Submit your completed form by email to info@suncoastconverters.com or mailing it to:
SunCoast PerformanceWarranty registration ensures your coverage is active and helps expedite any future service or claim.
No. SunCoast Performance warranties are non-transferable and apply only to the original purchaser or end user who bought the product.
This means that if the product is sold, traded, or installed in another vehicle, the warranty coverage becomes void. Maintaining proof of purchase and completing the warranty registration under your name ensures your coverage remains valid.
No, you won’t need to purchase a brand-new transmission or torque converter once your warranty expires. We offer a comprehensive refresh service for all of our complete transmission builds and torque converters.
This service allows you to have your existing unit inspected, serviced, and updated to the latest specifications, saving you the cost of a full replacement. Pricing varies depending on the condition of your components and any updates or parts required.
For an accurate quote or to schedule a refresh, please contact our sales team — they’ll be happy to provide details specific to your build.
We proudly support customers nationwide through our extensive network of authorized dealers and installers.
If you experience an issue, the first step is to contact our technical support team, who will help diagnose the problem and guide you through the warranty process. In many cases, we can ship the necessary replacement parts directly to resolve the issue quickly.
For more complex situations, we will coordinate with you and your installer to arrange the return of the transmission or component to our facility for a comprehensive inspection and repair under warranty.
Our rebuild kits themselves are not covered under a general warranty, as the final performance and longevity of a rebuild depend heavily on the installer’s workmanship and assembly practices.
However, individual components within the kit that are manufactured by SunCoast — such as our torque converters — are covered under their respective product warranties. Additionally, any third-party parts included in the kit are protected against manufacturer defects as defined by the original part manufacturer.
Because every builder’s process, equipment, and quality control standards vary, we’re unable to guarantee results for installations performed outside our facility. This policy ensures that warranty coverage remains fair, consistent, and based on factors within our direct control.
