I cannot thank Kosub Transmission enough. I recently had an intermittent rough shift issue in my 2024 GMC truck which was just past the OEM warranty. I started by taking it to a GM dealership. The dealership only offered to do a fluid flush and hope for the best. The dealer did the fluid flush and this did not fix the issue. I first called Kosub to see if they were willing to work on a newer, modern 10 speed transmission. There was no hesitation and they said to bring it on in. After the test drove the vehicle and performed diagnostics, Justin called with an update and a detailed plan. Within a few days, my truck was fixed. Justin‘s communication throughout this process is what stood out to me the most. While we were waiting for a part to be shipped, he called everyday with an update. Thank you Kosub family.
JS
James Sitka
Mar 10, 2026
5.0
Very honest and polite staff. Went in expecting the worst and drove out with an inexpensive repair and a functioning truck. Turns out instead of a rebuild it was only filters, previous shop installed a knock off filter that was causing my issues. Gerald took the time to show me where the failure was on the filter and the reasoning as to why it was causing my shifting issues.
This was my first time going to Kosub’s and they treated me like a life long customer. I cannot recommend them enough. If you’re looking for a honest shop please give them a call.
KW
Kevin Whitton
Dec 19, 2025
5.0
If you’re looking for transmission service, stop looking and bring your business to Kosub. Finding an honest and trustworthy shop is not easy anymore. This is the shop you can bring your diesel to and not have to worry. The help, attention, service, and education from Patrick and Justin are top notch. I appreciate you both for listening and then explaining the process, what you did, and what you found. You’ve got an easy and earned referral anytime I hear someone that needs transmission work and a lifelong customer the next time I need work or when I start my upgrades.
AC
ARMANDO CONTRERAS
Jul 29, 2021
5.0
Good work
JT
Jesse T
Oct 24, 2020
5.0
Another horrible Dodge story, my 2013 Journey left me in the Valley. I had it towed in and after a good service, they were able to bring it back to life. Completely honest that it could last another 100 miles or 1000000 miles, undeterminable because of the damage. It ran for another 50k miles before the engine failed. I am so grateful to Kosubs, another shop wanted 4k for an instant overhaul. I will be bringing in my other Dodge, I haven't learned my lesson, for a pre emptive service.
Frequently Asked Questions About Kosub Transmission
What services does Gerald Kosub Transmission Service offer?
They offer transmission rebuild, transmission repair, diagnostics, and Jasper transmission exchange services.
What are the business hours for Gerald Kosub Transmission Service?
They are open Monday to Thursday from 8:00 AM to 5:30 PM, and Friday from 8:00 AM to 5:00 PM. They are closed on Saturdays and Sundays.
Where is Gerald Kosub Transmission Service located?
They are located at 7455 US Highway 87 East, San Antonio, TX 78263, USA.
How can I contact Gerald Kosub Transmission Service?
You can reach them by phone at +1 210-648-4991 or email at kosub.svc@gmail.com.
Is Gerald Kosub Transmission Service a certified automotive specialist?
Yes, they are associated with ATSG, ATRA, and Jasper Engines & Transmissions, indicating certified transmission expertise.
Does Gerald Kosub Transmission Service provide honest advice and fair pricing?
Yes, they are known for honest advice, transparent pricing, friendly service, and fair estimates.
Where can I find more information about Gerald Kosub Transmission Service online?
Visit their website at https://kosubtransmissionsvc.com/ or their Facebook page at https://www.facebook.com/kosubtransmissionsvc/.
Are there any nearby banks where I can handle transactions before or after my visit?
Yes, American Bank and Texstar National Bank are nearby, which could be convenient for any banking needs around your visit.
Are there places to eat or relax near Gerald Kosub Transmission Service?
Yes, nearby options include Mr. Jim's Trading Post, The Trading Post, China Grove Trading Post Bar & Wendy and Moe's Kitchen, and The Tipsy Bull A Texas Bar & Grill for dining and drinks.
What other automotive services and shops are near Gerald Kosub Transmission Service?
Nearby automotive services include Kosub Transmission Service, Access Transmission, Finsanto Automotive, Gene Bowns Transmission, and Briones Tire Shop, which might be helpful for additional automotive needs.
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