August is National Traffic Awareness Month, a good time to talk about one of the most common (and overlooked) ways transmissions wear out: stop-and-go driving. If your daily commute involves a lot of traffic lights, school zones, or city streets, your transmission is working harder than you might think.
What Happens to Your Transmission in Traffic
Highway driving is actually easier on your transmission than city driving. Here’s why stop-and-go traffic takes a bigger toll:
Constant Gear Changes
Every time you accelerate from a stop, your transmission cycles through gears. In heavy traffic, that cycle repeats dozens of times per mile. More gear changes mean more wear on clutch packs, bands, and internal components.
Result: Faster wear on friction materials and shift components.
Heat With No Relief
Your transmission generates heat every time it shifts. On the highway, airflow helps keep temperatures in check. In stop-and-go traffic, that airflow is limited, and heat has nowhere to go.
Result: Sustained elevated temperatures that degrade fluid and internal parts.
Fluid Under Pressure
Transmission fluid circulates to lubricate and cool internal components. Repeated short-distance driving in traffic doesn’t give the fluid a chance to fully regulate temperature.
Result: Fluid breaks down faster, reducing its ability to protect the transmission.
Torque Converter Stress
In automatic transmissions, the torque converter is especially active during low-speed driving. Constant engagement and disengagement in traffic creates additional heat and wear.
Result: Accelerated wear on the torque converter over time.
Signs Traffic Is Taking a Toll
- Rough or hesitant shifts in low-speed traffic
- Shuddering when accelerating from a stop
- Fluid that smells burnt or looks dark
- Delayed engagement when shifting into drive
- Transmission warning light
How to Protect Your Transmission in Heavy Traffic
- Keep your transmission fluid fresh, city driving degrades it faster
- Schedule regular fluid checks, especially if your commute involves frequent traffic
- Address shifting issues early, don’t wait for them to get worse
- Avoid aggressive acceleration from stops, which puts extra strain on the system
- If your commute is mostly city driving, consider more frequent service intervals
City Driving Doesn’t Have to Mean Transmission Problems
Stop-and-go driving is unavoidable for a lot of Des Moines drivers. But with the right maintenance routine, you can significantly extend the life of your transmission, even with a demanding daily commute. If your vehicle is showing any of the signs above, it’s worth having it checked. Small issues caught early are almost always easier (and less expensive) to fix. Schedule your transmission check at alldrivetransmission.com