Why Pickup Trucks Have Such Low Top Speeds

Asia's Tech News Daily

© Car and Driver As we learned at the Toyota Tundra launch, it’s not just the tires. The driveshafts are a big problem—literally.

At last week’s launch for the 2022 Toyota Tundra, there was a bare chassis on display—all the running gear in place, but no body. Since I ask all the important questions, I inquired about that most important spec for pickup trucks: top speed. With 437 horsepower in the hybrid models, an ungoverned Tundra would run out of gear around 165 mph. Yet, as expected, the new Tundra is governed to around 100 mph, topping out at a claimed 106 mph. You’d figure that paltry number is because the tires aren’t rated to go much faster, and that’s true. But it’s not the whole story. There are tires that will handle higher speeds, but there’s no point in using them, because the primary impediment to autobahn-ready pickups is the rear driveshaft. Or, more accurately, driveshafts.

© Car and Driver The 2004 Dodge Ram SRT-10 did 150 mph. And it was a shorty.

As Toyota engineers explained, modern trucks are heavy, powerful, and often very long. In the case of the 2022 Tundra, there’s only one iteration that even uses a single-piece driveshaft—the short-bed hybrids with the smaller double cab, which have a 145.7-inch wheelbase. (The electric motor adds some length to the drivetrain, putting the tail end of the transmission or transfer case close enough to the rear axle to get away with a single driveshaft.) And two-piece driveshafts that are designed to accommodate 583 pound-feet of torque do not like to spin at the rpm required for big top speeds. Especially in a vehicle that can, in long-bed crew-cab form, be 21 feet long. Surely, there’s a way to precisely balance the driveshafts to enable a higher top speed, but it’s just not worth it. Which is one reason why we have the 707-hp Ram TRX topping out at 118 mph, the 450-hp Ford Raptor hitting 118, and the much smaller and less powerful Nissan Frontier briefly claiming the title of fastest governed pickup with a mere 120-mph top speed.

© Car and Driver A CrewMax long-bed Tundra is more than 20 feet long and can have 583 pound-feet of torque. It needs two driveshafts to reach the rear axle.

We took it for granted that performance trucks like the 2004 Dodge Ram SRT-10 and the 2001 Ford SVT F-150 Lightning were built with regular-cab, short-bed bodies in the name of weight minimization. But keeping the driveshaft short was probably also helpful in ungoverned trucks that could hit 142 mph (the Ford) or 150 mph (the Dodge). The fastest production four-door truck we ever tested, the 2004 Dodge Ram SRT10 Quad Cab, hit 147 mph. Its wheelbase is about five inches shorter than the shortest 2022 Tundra, and even with its 8.3-liter V-10, it made 58 fewer pound-feet of torque than the hybrid Tundra.

But if it seems like we’re forever consigned to huge trucks with massive horsepower that will ultimately get dusted by a Mazda 3 on the top end, there is hope. Electric motors don’t need very long driveshafts at all.

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