The series production Tesla Semi has been a long time coming. Kyle Conner from Out of Spec Reviews got seat time at ACT Expo in Las Vegas alongside Dan Priestley, who leads the Semi program at Tesla. The truck on display represents a meaningful departure from the early beta fleet that spent years gathering data. The most visible change is the front end: a three-piece fascia that reduces repair costs after minor yard incidents, new headlights shared with other Tesla products, and more aerodynamic body surfacing. Under that, the updates go deeper: a 48V architecture, Ethernet-based communications, and a battery pack now built on 4680 cells, bringing production alignment with Tesla's other current platforms. This is the truck that fleets are actually buying.
The Semi comes in two configurations. The standard range version weighs under 20,000 lb and carries approximately 48,000 lb of payload in a typical drive van setup, targeting regional and shorter-haul routes where the lower curb weight is the priority. The long range is identifiable by its extended wheelbase and a distinctive storage bay between the axles: that bay contains the third of three battery packs, which is why it doesn't exist on the standard range. Curb weight on the long range rises to 23,000 lb, and payload drops to around 45,000 lb in exchange for 500 miles of range with a load. Both variants sit under the 82,000 lb gross combination weight limit, with electric trucks qualifying for a 2,000 lb DOT bonus over the standard 80,000 lb. Tesla hasn't published battery capacity figures, treating range and operational capability as the more useful metrics for fleet buyers.
The drivetrain uses two physically separate rear axles. The forward one, the torque axle, carries two motors with a higher gear ratio and handles initial takeoff, hill climbs, and high-speed overtakes. The rear axle, the efficiency axle, runs a single motor tuned for highway cruise. Once the truck reaches sustained highway speed and sustained torque is no longer needed, the torque axle clutches out: the gearbox internals stop spinning and windage losses drop to zero. Re-engagement is seamless. The efficiency axle reaches its capacity limit before the torque unit fully synchronizes, so there is no lag or jerk when the system reconnects. Power output ranges from 525 kW to 800 kW depending on the spec selected. Steering has moved from hydraulic to fully electric assist, which has quieted the cabin noticeably compared to earlier builds. MCS 3.2 charging supports the truck's 1.2 MW capable inlet. The 25 kW ePTO port on the side, demonstrated with a fully electric Thermo King refrigeration unit, is part of a developing industry standard for electric trailer power: a committee is actively finalizing the connector and communication protocol, similar in intent to what J1772 and NACS did for passenger car charging.
Bottom line: The series production Semi is a more coherent vehicle than the early fleet hinted at, and Priestley's willingness to talk openly about cost structure, payload trade-offs, and the charging standards process is exactly what fleets considering a long-term commitment to this platform need to hear.