ok, i just had an idea after reading this. i was going to suggest the "4x4 front axle driven by electric motor" idea again (for the s-10, with the existing drivetrain going to the rear), but i got to thinking.....
hook it to a transfer case instead. find a transfer case from a 4x4 s-10 (and some parts off the 4x4 transmission). hook the electric motor to the output that would normally go to the front wheels. shift transfer case into 4x4 and transmission into N to drive on electric only. that would make a 1 speed electric for around town. shift transfer case back into 2wd to drive on gas-only.
i don't know, i may be way out in left field, but thought i would throw it out there anyway.
or (keep 2wd) and put the electric motor in the bed. chain drive to the output on the transmission. (find a way to put a sprocket in between the output flange and driveshaft)
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