Freightliner's M2 106 Plus Gets Two New Powertrains: An Allison Automatic and a DEF-Free Gas Engine

Daimler Truck North America and Allison Transmission just announced two genuinely different new powertrain combinations for the Freightliner M2 106 Plus, and they're aimed at two different kinds of buyers entirely. One pairs a faster-shifting automatic with a diesel engine for fleets that want more capability. The other skips diesel altogether, running on gasoline with no DEF and no traditional aftertreatment system at all. If you run or are considering an M2 106 Plus for a landscape dump body, utility box, or lighter vocational application alongside your heavier 114SD dump truck fleet, both options are worth understanding before your next order.

Option One: The Allison 3414 RHS Paired With the Cummins X10

The first new option is Allison's 3414 Regional Haul Series (RHS) transmission, paired specifically with the Cummins X10 diesel engine, with production starting in January 2027. Allison is marketing the 3414 RHS around a genuinely measurable claim: 25% faster acceleration compared to competing automated manual transmissions, plus a lighter overall package in its weight class. For a vocational-adjacent fleet running an M2 106 Plus in stop-and-go work, faster acceleration out of every stop is a real, cumulative time savings over a full day of routes.

The Cummins X10 itself is worth a quick note, since it's a newer engine family rather than a rebadged existing one. It slots into Cummins' lineup below the long-running L9 and X12, aimed specifically at medium-duty applications that need more capability than a straight B6.7 diesel but don't need the weight or cost of a full heavy-duty engine. Pairing a newer mid-range engine with a newer transmission in the same announcement suggests Daimler Truck and Cummins are treating the M2 106 Plus as a genuine platform for fresh engineering investment, not just a legacy chassis getting an incremental running change.

The 3414 RHS isn't brand new to the Allison lineup, it's also recently become available on International's RH Series, which tells you Allison is pushing this specific transmission across multiple OEM partners at once rather than building something Freightliner-exclusive. That cross-brand availability is actually good news for buyers: it means parts, training, and dealer familiarity with the 3414 RHS will scale faster than a single-manufacturer-exclusive transmission typically would. Allison has taken a similar multi-OEM approach with its other recent product launches too, a sign the company is prioritizing broad platform reach over any single exclusive partnership right now, which generally benefits buyers through faster dealer-network familiarity and more competitive OEM pricing.

Option Two: A Gasoline Engine That Skips DEF Entirely

The second option is more unusual: a Cummins B6.7 Octane gasoline engine, rated under 300 horsepower, paired with a newly announced Allison 9-speed transmission that supports multiple PTO configurations. Order books opened immediately, with production starting in July 2026, and for now the M2 106 Plus is the engine's exclusive launch platform.

The real engineering story here is what the B6.7 Octane doesn't need. Running on gasoline instead of diesel lets it skip diesel exhaust fluid and the selective catalytic reduction hardware that comes with it, no DEF tank to fill, no SCR catalyst to maintain, no risk of deadlining a truck over a DEF-quality fault code. A Daimler Truck product marketing manager summed up the pitch directly: the goal is “diesel-like performance out of a gasoline setup” for fleets that want to simplify operations. The engine also supports multiple exhaust routing layouts, in-rail, under-step, or vertical stack, so it adapts to whatever body a contractor is bolting on rather than forcing one configuration.

There's a broader industry story behind why a truck-engine maker builds a gasoline engine at all in 2026. Diesel aftertreatment systems keep getting more complex and more expensive to maintain as emissions standards tighten, and EPA2027 compliance has pushed those costs higher across every diesel option in this weight class. A gasoline engine sidesteps that entire cost curve, no particulate filter regeneration cycles, no urea dosing system, no NOx sensor replacements. For a fleet manager tracking total cost of ownership rather than just the sticker price, that's a genuinely different maintenance budget line, not just a fuel-type preference.

Why Daimler Truck Is Betting on Two Very Different Powertrains at Once

It's worth noticing that Daimler Truck didn't pick one direction here, it's offering a higher-performance diesel automatic and a simplicity-focused gasoline engine on the same chassis in the same year. That's a direct response to how split the medium-duty buyer base actually is right now. Some fleets want more capability and don't mind the complexity that comes with it; others are exhausted by DEF-related downtime and genuinely just want a truck that starts, runs, and doesn't need an aftertreatment conversation at every service interval.

It's also part of a broader pattern worth watching across every brand we cover. Kenworth, Mack, and International have each leaned hard into expanding diesel engine choice and, in Kenworth's case, a battery-electric option, while Freightliner is now the first of the four to bring a genuinely DEF-free gasoline option to a mainstream vocational-adjacent platform. No single brand has yet offered every powertrain path at once, which means the right choice today still depends heavily on your specific duty cycle rather than a single obviously-correct answer across the industry.

The target applications Cummins and Daimler Truck are naming publicly for the B6.7 Octane, box trucks, utility bodies, tree care, delivery, are a reminder that this specific engine isn't primarily a heavy construction dump-truck powertrain. But for contractors who run a mixed fleet, a lighter M2 106 Plus with a landscape dump or small utility dump body alongside a heavier 114SD or HX for real construction hauling, the B6.7 Octane is a legitimate way to simplify the maintenance profile of the lighter half of that fleet.

There's also a genuine Florida angle worth flagging. Gasoline engines run hotter-climate duty cycles well, and a lighter-weight vocational truck without DEF logistics is a real advantage for the small-lot landscape and debris-hauling dump bodies common on new residential development sites across the state, work that often runs a lighter M2 106 Plus rather than a full severe-duty 114SD. Skipping DEF quality monitoring in Florida's heat and humidity, where DEF can degrade faster if it sits too long in a hot tank, is a small but real operational win.

What This Means for Your Next M2 106 Plus Order

If you're spec'ing an M2 106 Plus for lighter vocational work and your routes are mostly stop-and-go within a service area, the gasoline B6.7 Octane plus Allison 9-speed combination is worth a serious look purely on uptime math: fewer regen cycles, no DEF purchasing or quality monitoring, and simpler PTO integration for whatever body you're mounting. If your routes lean more regional-haul with steadier highway miles and heavier loads, the 3414 RHS paired with the Cummins X10 diesel is the more capable combination, with that genuine 25% acceleration improvement actually mattering over a full day of grade changes and merges.

The PTO flexibility built into the new Allison 9-speed also deserves a mention for anyone working with a body builder. Multiple PTO mounting configurations mean your upfitter has more real options for where a hydraulic pump, generator, or other driven accessory actually gets mounted, rather than being boxed into whatever single PTO location the previous nine-speed offering supported. That's a small spec-sheet line that can save real money and redesign time at the body-builder stage.

From a financing standpoint, this is exactly the kind of manufacturer behavior worth paying attention to before your next loan or lease application. A chassis platform receiving two brand-new powertrain options in the same model year tends to hold its resale value better over a five- or six-year loan term than a platform that hasn't seen meaningful investment in years, because dealers, lenders, and used-equipment buyers all read active engineering investment as a signal that the manufacturer intends to keep supporting that platform for the long haul. That matters just as much as the horsepower number when you're deciding how to structure your next purchase.

Either way, both options reinforce something worth remembering when you're financing: a manufacturer launching two distinct new powertrains on the same platform in the same year is investing real engineering dollars in that chassis's future, which is a genuinely good sign for long-term parts support and resale value on the M2 106 Plus specifically.

The Bottom Line

The Freightliner M2 106 Plus just got genuinely more flexible rather than just incrementally updated. A faster-shifting diesel automatic landing in January 2027, and a DEF-free gasoline engine already taking orders for July 2026 production, give buyers two real paths depending on duty cycle instead of a single one-size-fits-all spec. If any part of your fleet runs an M2 106 Plus for lighter vocational work, this is a good year to revisit dump truck and mixer truck financing options for your mixed fleet alongside your spec sheet.

Ready to finance your next Freightliner M2 106 Plus, 114SD, or mixed fleet build? Visit our home page to learn more about BFC Equipment Loans, apply for financing in minutes, browse our buy-and-sell marketplace for used dump trucks and mixers, or subscribe to our blog for daily coverage of new equipment and financing strategy.