That is sort of how the BMW I8 works. The front wheels are electric and the rear gas.
The Gm Tahoe/Silverado/Esclade hybrids use a special transmission that is the size of a 5 speed Allison automatic that contains the electric motors. They can run pure electric mode. Some F450s and above came with Powerstrokes and allison transmissions so maybe there is a way to bolt the hybrid transmission to the diesel.
I know Banks put a I6 Cummins in an aero Dakota and got pretty impressive numbers w/o any hybrid stuff. Imagine what an I4 Cummins would do.
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