San Antonio’s Trusted Transmission Experts
Family-Owned. Professionally Rebuilt. Built to Last.
San Antonio’s Trusted Transmission Experts
Family-Owned. Professionally Rebuilt. Built to Last.
San Antonio’s Trusted Transmission Experts
Family-Owned. Professionally Rebuilt. Built to Last.
About Our Shop
Trusted Transmission Specialists Serving San Antonio and Beyond
Family Values, Certified Expertise, Proven Transmission Work.
For more than three decades, Kosub Transmission Service has been San Antonio’s trusted name in automatic transmission rebuilding and replacement. Founded by Gerald and Donna Kosub and now joined by their son Nathan Kosub, our family-owned and operated shop continues to uphold the same dedication to honesty, precision, and craftsmanship that has defined us since 1996.
We specialize exclusively in transmissions, offering expert service for Chevrolet, GMC, Dodge, RAM, Ford, Lincoln, Cadillac, and Jeep vehicles. Whether you drive a Ford 10R80 or a Chevrolet/GMC 6L80E, 8L90E, 10L80E, or 68RFE transmission, our certified technicians ensure every rebuild meets the highest standards of quality and reliability.
Family-Owned & Operated since 1996
Certified Transmission Specialists
Automatic Transmission Rebuilding & Replacement
Proudly Serving San Antonio & Surrounding Counties
Our Expertise
At Kosub Transmission Service Inc, our experienced technicians bring over a century of combined knowledge to every job. We specialize in transmission repair for domestic vehicles and use advanced diagnostic technology to pinpoint problems quickly and accurately. Our expertise ensures lasting repairs.
Our Approach
We believe in open communication and transparency with every customer. Our team takes time to explain each recommended service so you understand exactly what your vehicle needs and why. By keeping our customers informed, we build trust and deliver the professional, high-quality care your vehicle deserves.
Our Commitment
At Kosub Transmission Service Inc, honesty and integrity guide everything we do. We value the long-term relationships we’ve built with our customers and work hard to earn their confidence with every repair. Our goal is simple—to exceed your expectations and keep you driving with peace of mind.
Our Transmission Services
Focused on Automatic Transmissions Only
Specialized Expertise. Reliable Results. Proven Quality.
At Kosub Transmission Service, founded by Gerald and Donna Kosub and now joined by Nathan Kosub, we focus exclusively on automatic transmissions — it’s what we do best. From complete rebuilding and replacement to routine fluid and filter maintenance, our certified specialists deliver precise workmanship and dependable results.
We service and rebuild a wide range of models, including Chevrolet, GMC, Dodge, RAM, Ford, Lincoln, Cadillac, and Jeep transmissions — from the Ford 10R80 to Chevrolet/GMC 6L80E, 8L90E, 10L80E, and 68RFE units. We never install used transmissions, ensuring every job meets our high standards for performance, reliability, and longevity.
Transmission Maintenance
Protect your investment with regular fluid and filter maintenance. Our team helps extend the life of your transmission and prevent costly future repairs.
Rebuilding & Replacement
We specialize in complete transmission rebuilding and replacement using trusted components and precise workmanship to restore factory-level performance and reliability.
Diagnostic Evaluation
Our technicians use advanced diagnostic tools to accurately identify transmission issues and recommend the best, most cost-effective repair solutions.
Our Professional Affiliations
Trusted Industry Partners and Certified Memberships
Recognized, Certified, and Connected to the Best in the Business
We’re proud to be part of respected industry organizations that uphold the highest standards in transmission service. Through our partnerships with ATSG, ATRA, and Jasper Engines & Transmissions, we stay current with the latest training, technology, and quality practices that keep our customers on the road with confidence.
ATSG Member
As proud members of the Automatic Transmission Service Group (ATSG), we stay current with the latest diagnostic tools, training, and repair standards for today’s advanced transmission systems.
ATRA
Member
Our Automatic Transmission Rebuilders Association (ATRA) membership reflects our commitment to professionalism, ethical practices, and expert craftsmanship in every rebuild we perform.
Jasper Installer
As an authorized Jasper Engines & Transmissions installer, we provide American-remanufactured transmissions backed by industry-leading quality, reliability, and warranty protection.
Customer Reviews
Real Stories. Reliable Service.
See Why Drivers Trust Us
Our customers say it best. From everyday maintenance to major transmission replacements, drivers count on our shop for honest answers, quality workmanship, and dependable parts. We’re proud to pair our service with Jasper Engines & Transmissions—giving you results that last and a warranty to prove it.
Get in Touch
We’re Here When You Need Us
Call, Message, Visit, or Book Now—It’s That Simple
Whether you need quick answers or want to schedule an appointment, we make it easy to connect. Fill out the form, give us a call, stop by the shop, or click the “Book Now” button to request service. We’re always happy to help, and we’ll get back to you as soon as possible.
Mon - Thu: 8 am - 5:30 pm
Fri: 8 am - 5 pm
Send Us a Message
Contact Us
We will get back to you as soon as possible.
Please try again later.
Serving Atascosa, Bexar, Comal, Guadalupe, Wilson County and surrounding areas
