Chevy and GMC Transmission Repair in San Antonio, TX
Is your Silverado or Sierra slamming into gear, slipping on the highway, or shuddering at a steady speed? Does your Tahoe, Suburban, or Yukon feel like it is hunting for the right gear? If you drive a Chevy or GMC here in San Antonio and the transmission is not behaving the way it used to, it is worth understanding what is going on before it grows into something bigger. Here is a plain look at the transmissions these trucks and SUVs use, what drivers tend to notice, and what to do next.
The transmissions in most Chevy and GMC trucks
The most common transmission in Chevy and GMC trucks and SUVs from the late 2000s through the late 2010s is the 6L80E. It is a six-speed automatic found in many Silverado and Sierra 1500 pickups, Tahoes, Suburbans, Yukons, and Escalades. Its heavier duty sibling, the 6L90E, is built to handle more weight and shows up in many gas-powered heavy-duty pickups and in full-size vans like the Express and Savana.
These are strong transmissions, and they are some of the units we know best. We have a full page on our 6L80E and 6L90E custom rebuilt transmissions, including upgraded builds for trucks that tow, run lifts and bigger tires, or have added horsepower.
Newer Chevy and GMC trucks and SUVs have moved to eight-speed and ten-speed automatics. More gears help with fuel economy and towing, and they also mean the transmission is shifting more often, so drivers tend to notice when something changes.
What Chevy and GMC drivers tend to notice
The complaints we hear from owners are usually easy to describe even if the cause takes some finding. A shudder or vibration at a steady cruising speed, often somewhere between thirty and fifty miles per hour, is one of the most common, and it can feel like driving over rumble strips on smooth pavement. Harsh or clunky shifts, especially between the lower gears, are another. Some drivers notice slipping, where the engine revs but the truck does not pull like it should, or a delay before the truck moves after shifting into drive or reverse. On trucks that tow in the summer, the transmission can run hot and shift poorly until it cools off.
If any of this sounds familiar, our pages on shuddering when accelerating, slipping, and delayed engagement go through each symptom in more detail.
Why it happens
Most of these problems come back to a few causes. Transmission fluid that is old, low, or worn down by heat is near the top of the list, and fluid breaks down faster in San Antonio heat, especially in trucks that tow or sit in traffic on Loop 410. The fluid is what lets the internal parts grab smoothly, so when it breaks down, you start to feel it as shudder or rough shifting. Internal wear on the parts that grip and hold each gear is common on higher mileage trucks. The part inside that controls fluid pressure and directs each shift can also wear, which leads to harsh or erratic shifting. Electronic sensors and controls round out the list.
Some of these causes are a service. Some call for a rebuild. The only way to know which one you have is a proper diagnosis.
How we handle Chevy and GMC transmissions
You do not need to know which transmission your truck has before you call. At Sergeant Clutch Certified Engine and Transmission Repair Shop on Walzem Road on the Northeast Side of San Antonio, our certified mechanics start by finding the real cause. We check the fluid, scan for codes, and test how the transmission behaves under load, then explain in plain terms what is going on and what your choices are. Nothing gets done without your approval.
When a 6L80E or 6L90E needs a rebuild, we build it to last, and we can build it heavier duty for trucks that work hard. For the newer eight-speed and ten-speed units, our mechanics diagnose and repair them like any other vehicle we see, and when replacement makes more sense, we install Jasper remanufactured transmissions. You will know the problem and the plan before we pick up a tool, and we stand behind the work with a limited parts and labor warranty.
Can you keep driving it
A light shudder now and then usually does not mean you have to park the truck today, but it is a sign to have it checked soon. If the truck is slipping, slamming into gear, or dropping out of gear, it is better to stop adding miles, and it is a good idea to stop towing until it has been looked at. We offer free towing with your transmission service, so you do not have to nurse your truck across town to get it to us.
We serve San Antonio, Windcrest, Converse, Live Oak, Universal City, Randolph AFB and the whole Northeast Side from 6557 Walzem Rd., San Antonio, TX 78239, Monday through Friday, 8:00 AM to 6:00 PM.
If your Chevy or GMC transmission is not acting right, the simplest move is to have it looked at now, and you are welcome to call Sergeant Clutch at (210) 239-1600 to set that up. Ask about our financing, with payment plans and no credit needed through Synchrony Car Care, Easy Pay Finance, and SNAP Finance, so you can get your truck back to work without the wait.
PAYMENT PLANS! NO CREDIT NEEDED*
