Future of Car Transmissions in Numbers

Predictions about car transmissions are easy to find. The production and sales numbers tell a steadier story. Electric cars are now a quarter of what's sold worldwide, hybrids are growing faster than plug-ins in the US, and the average car on American roads is older than it has ever been. This article lays out the latest figures from the EPA, the IEA, the EIA and S&P Global Mobility so you can see what's actually changing under the hood, and what it means for the transmission in your own driveway.

"Electrified" covers three different things, and the difference matters for transmissions. A battery electric vehicle (BEV) runs on a battery alone. A plug-in hybrid (PHEV) charges from the wall but keeps a gas engine and a gearbox. A conventional hybrid never plugs in and always has a transmission of some kind. In the US, that third group is where the growth is.

What to take from this: the US is electrifying more slowly than the world average, and the fastest-growing slice here is the conventional hybrid, which still has a transmission. Subtract the EIA's 7.5% BEV and 1.6% PHEV figures from its 22% total and roughly 13% of 2025 sales were hybrids with no plug at all.

Walk any new-car lot and most of what you'll see is still a gasoline vehicle with an automatic transmission, but the mix is moving. The EPA's Automotive Trends Report tracks what automakers actually build each model year. Its preliminary model year 2025 data look like this.

Set that against the final model year 2024 numbers from the same table: gasoline with no hybrid system at 74.8%, strong hybrids at 9.5%, BEVs at about 7%, mild hybrids at 5.3% and plug-ins at 2.5%. The biggest single move is the strong hybrid, up 4.5 points in one year. Add the three hybrid types together and 21.5% of preliminary model year 2025 production has both a gas engine and an electric motor, and every one of those vehicles has a transmission (EPA, 2025).

On the gearbox side, 8-speed automatics have been the most common transmission since model year 2019, and preliminary model year 2025 data put them at 30.4% of production, with nine-or-more-speed units at 20.6%, non-hybrid CVTs at 19.2% and hybrid CVTs climbing to 11.0% as hybrid sales grow. Diesel engines were most often paired with a ten-speed lockup automatic.

It's a common belief that electrified cars don't have transmissions. That's only half true. The Department of Energy's Alternative Fuels Data Center lists the transmission as a standard hybrid component that "transfers mechanical power from the engine and/or electric traction motor to drive the wheels." Every hybrid has one.

The EPA's own summary is blunt: "BEVs are generally designed without a traditional transmission and utilize a single speed design. However, a limited number of high-performance EVs do have a 2-speed transmission." The Taycan is the best-known example; the Porsche Newsroom explains that the short first gear multiplies torque for launches and the long second gear keeps the motor efficient at freeway speed. Mild hybrids sit at the other extreme. In model year 2024, 100% of them were paired with a transmission of seven or more speeds, most often an 8-speed or 9-speed automatic. Plug-in hybrids are mixed, with 61.5% on a seven-plus-speed automatic and 23.8% on a CVT (EPA, 2025).

What that means mechanically

• Single-speed EV: one reduction gear, a differential and gear oil. There are few wear parts, but the unit is sealed, and bearing, seal and differential problems still show up.
• Two-speed EV: a shiftable planetary set behind the motor, so there is a shift element that can wear and a fluid that has to stay clean.
• Hybrid CVT: in most designs the engine and two motor-generators share a planetary gearset, with no belt and no clutch packs to burn, but the fluid still lubricates the gearset and the motors inside it, and it ages like any other fluid.
• Hybrid with a multi-speed automatic: mild hybrids and most plug-ins keep an 8-, 9- or 10-speed unit with a motor built in, so clutch packs, solenoids, the valve body and the torque converter are all still there.

Our earlier post on hybrid car transmissions covers how those systems blend engine and motor power.

Sales share and fleet share are two different things. Only a small slice of the cars on the road were sold this year. S&P Global Mobility counted 289 million light vehicles in operation in the US with a steady 4.5% scrappage rate, and the average one is now 12.8 years old. Passenger cars average 14.5 years and light trucks 11.9. Even with registrations above 16 million in 2024, the fleet keeps getting older.

The EIA makes the same point from the other side: because annual sales are small next to the total fleet, EVs' share of vehicles on the road is far below their 9% sales share. The average BEV in S&P's data was just 3.7 years old, against 12.8 years for the fleet as a whole. Put those numbers together and the car you're driving in 2030 is more likely to be the one in your driveway now than a new EV.

What the trends mean for your transmission

• Your car is probably a conventional automatic: in model year 2024, about 75% of new vehicles were gasoline-only, and nearly every one of them has a torque-converter automatic or a CVT (EPA, 2025). Older cars on the road skew even more that way.
• Newer automatics have more to go wrong: eight, nine and ten gears mean more clutch packs, more solenoids and a more complex valve body than a six-speed.
• Hybrids still need transmission service: in most designs a hybrid CVT has no belt, but it does have fluid, bearings and seals, and the motor-generators inside depend on that fluid staying clean.
• Fluid matters more, not less: tighter tolerances and more electronics make modern units sensitive to old or incorrect fluid. A fluid and filter change with the manufacturer-approved fluid is the least expensive service a modern unit gets.
• Diagnosis comes first: a scan-tool check, a pressure test and a road test tell you whether a shift complaint is a solenoid, a valve body or the fluid, and a proper diagnostic should end with a written recommendation.

At the pace these numbers show, conventional and hybrid transmissions will be the bulk of what's on the road for well over a decade. If yours is shifting late, slipping or running hot, don't wait for the market to change. Trans Medic Transmissions works on everything from four-speed trucks to ten-speed automatics, and can tell you what's actually happening before a small problem turns into a rebuild.