As the premium extension of the Jeep® brand, the Grand Wagoneer marks the return of a premium American icon. So what better vehicle to introduce one of the most anticipated new propulsion systems of the Chrysler Group’s decades.
The all-new 3.0-litre turbocharged straight-six, known internally as the “GME-T6”, will make its world debut this month at the New York International Auto Show (NYIAS). The new GME-T6 is part of the Stellantis Global Medium Engine family and is the first straight-six to find its way under the hood of a Jeep product since the legendary 4.0-liter straight-six was discontinued.
Thanks to our well-placed sources, we know that there will be three variants of the GME-T6 available for future Stellantis products. The first version to enter the mix, which will debut on the Wagoneer lineup next month at NYIAS, will be the High-Output (HO).
We know for sure that the HO version will debut at NYIAS. Our avid spy photographers caught one of the new HO models testing on public roads in the Detroit metro area. Although the spy photographs don’t show much of a change from the HEMI powered models, we can see that the GME-T6 HO models will feature dual exhaust and require Premium Unleaded Fuel (as per the decals at above the fuel filler flap) . With gasoline prices rising, we hope the new GME-T6 HO can achieve a fuel economy rating good enough to justify the premium fuel requirement.
Of course, Jeep currently recommends 91 octane premium fuel for 6.4-liter Grand Wagoneer models with HEMI V8 engines.
The 3.0-litre GME-T6 HO inline-six will be followed by a plug-in hybrid (PHEV) model in 2023.
The GME-T6 PHEV arrives just in time as gasoline prices continue to rise in the United States and Canada. The PHEV is expected to run a system similar to the recently launched Grand Cherokee 4xe.
We expect the ZF-sourced 8P75PH 8-speed automatic transmission to be installed on the GME-T6 PHEV. The ZF unit includes a high voltage motor-generator rated at 134 horsepower (100 kW) and 181 lb-ft. (245 Nm) of torque, is mounted at the front of the transmission housing, replacing the conventional torque converter of an automatic transmission. Two clutches operate to manage power and torque from the electric motor and motor. A binary clutch (start/stop) is mounted between the motor and the motor. When this clutch is open, there is no mechanical connection between the engine and the electric motor, which allows it to propel the vehicle in electric mode only.
We also believe the GME-T6 PHEV will feature an eTorque liquid-cooled high-voltage generator set at the front of the engine, replacing the conventional alternator. A sturdy belt connects the motor-generator to the engine’s crankshaft pulley. The motor-generator spins the engine for nearly continuous, fuel-efficient start-stop operation and generates electricity for the battery. Currently, Jeep 4xe models do not use a conventional 12-volt starter. Instead, they come with a 12-volt battery to run accessories.
Nothing has been confirmed regarding the introduction of the GME-T6 PHEV model at this year’s NYIAS.
It is expected that the Long Wheelbase (LWB) variants of the Wagoneer and Grand Wagoneer (WS) will also be showcased at the NYIAS event. Press conferences are scheduled for Wednesday April 13 and Thursday April 14. You can expect us to cover the entire event, no matter what day it happens.
For those who currently own a Wagoneer/Grand Wagoneer or are considering buying one, be sure to visit our dedicated owner’s website, WagoneerForums.org. There you can talk about the latest news, information and rumours, as well as connect with other owners and even Wagoneer customer services.
2023 Jeep® Grand Wagoneer Series II GME-T6 Tester Image Gallery: