Circle D Transmission

04/23/2026

Love the Cosmic Red - looks like a great build. Thank you for sharing with us and for placing your trust in our products!

03/20/2026

03/18/2026

Classic curves, modern guts.
This 1968 Cutlass convertible is getting new life with our custom-built 4L60 transmission.
If you’re restoring a classic and want updated performance under the hood, Circle D has your back.
📸
While the exterior and interior will be very reminiscent of the original car, the underpinnings have been updated to modern technology, in an effort to increase not only drivability and performance but also safety. A few of the upgrades include:
* Sport GT chassis with 9” Ford differential
* LS3 (built to emulate an Oldsmobile engine)
* -built 4L60e transmission
* Engine and Transmission powder coated “Goldsmobile” color
* 14”, 6 piston brakes
* Electric power brake booster (Tesla)
* Coach Controls wiring system
* Air climate control
* retro gauges
* custom radiator
www.circleDtrans.com
713-895-7019
M-F 7:00 am-5:00 pm CST
[email protected]

02/08/2026

Please keep the Circle D family in your thoughts and prayers. Patricia was a driving force behind Circle D’s success. Even though she has been retired for the past few years, her impact, dedication, and presence have never left this place — and her absence will be deeply felt.

There will never be another like her.

Celebrate the life of Patricia Sehorn, leave a kind word or memory and get funeral service information care of Pat H. Foley & Company.

06/06/2025

49 years ago today, my parents took a leap of faith and opened the doors to Circle D Transmission. I had just turned 2, and my brother Chris was only a few months old. With babies in tow, they poured everything they had into building this business from the ground up.
It hasn’t always been easy—but they persevered through every challenge with grit, integrity, and heart. And because of that, this business has been a true blessing in my life. I grew up here. I met my husband here. Proof that Circle D gave me more than just a career. It gave me a life.
While my dad is no longer with us—he fought a courageous battle with ALS—and my mom is now enjoying a well-earned retirement, their legacy lives on in every vehicle we repair and every customer we serve.
We are so grateful for the trust our clients continue to place in us. Your support means everything. Here’s to 49 years of transmission excellence—and many more to come. With deep appreciation and gratitude ~Sherry ❤️ From our family to yours, thank you.

www.circleDtrans.com
713-895-7019
M-F 7:00am-5:00pm CST
[email protected]

11/22/2024

Get the BEST for LESS with Circle D Transmission’s Performance Transmission Rebuild Kits!
🔥 Black Friday Sale Alert! For 10 Days Only!🏁
Prices will never be this low again. Now’s your chance to upgrade your 6L80, 6L90 or 8L90. Quality You Can Trust!
Tag your car crew and spread the word—this Black Friday deal is a GAME CHANGER!
www.circleDtrans.com
713-895-7019
M-F 7:00 am-5:00 pm CST
[email protected]

09/15/2024

Check out this CDT 10L90 performance rebuild!
We’ve got you covered with: Mods to the E clutch drum & CDF clutch drum for increased capacity including Raybestos GPZ friction plates for unbeatable performance. We also provide solutions for cooler flow, line pressure, lock-up hold, and shift speed.
Our rebuild process and upgrades are designed to boost both performance and durability, ensuring your 10L90 transmission runs stronger than ever. �www.circleDtrans.com
713-895-7019
M-F 7:00am-5:00pm CST
[email protected]

08/30/2024

🎉 Celebrating 35 Years of Excellence with Circle D Transmission!

Today, we’re thrilled to honor a true cornerstone of the Circle D Transmission family—Glenn Riske👏

For 35 incredible years, Glenn has been a driving force behind our success. He consistently goes above and beyond to ensure top-quality work and exceptional customer service. His unwavering commitment and positive attitude have made a profound impact on our team and our organization as a whole.

We are truly fortunate to have him as a part of the Circle D Transmission family and we look forward to many more years of continued excellence together. We’re so very grateful for his loyalty and the tremendous impact he’s made on our company and our clients.

Join us in congratulating Glenn on this incredible milestone! 🎉

08/29/2024

2019 Chevrolet Grand Sport Corvette with an - Level 4 CDT Rebuild that included a Billet Input Shaft, Raybestos Clutch and Steel Modules with added clutch capacity beyond the drop-in GPZ clutch module in C3, C4 & C5, Upgraded C3 Drum, hydraulic circuits all cleaned up with CDT valve-body mods and a Hi-Per Blue C1 (1-2-7-8-R) Piston. Tuned by - 817rwhp/714rwtq on 93 octane.

At Circle D Transmission, we’re passionate about powering your performance! We specialize in building high-performance automatic transmissions that elevate your driving experience.

Join the ranks of satisfied drivers who trust Circle D Transmission for unbeatable quality and performance. Get in touch with us today and let’s rev up your ride! 🔧
www.circleDtrans.com
713-895-7019
M-F 7:00am-5:00pm CST
[email protected]

07/09/2024

is working hard to restore power to -Town … hopefully our city will be up and running soon.
www.circleDtrans.com
713-895-7019
M-F 7:00 am-5:00 pm CST
[email protected]

06/26/2024

FSi Racing & Tuning