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i've been thinking about this same subject for a while now.
here are 2 ideas i've been thinking about (both with manual transmission)....
keeping 2wd:
-mount some heavy-duty sprockets between transmission output and rear driveshaft.
-chain drive to an electric motor sitting either beside the transmission, or in the bed.
-need a "sprag clutch" or something similar, so the electric motor doesn't spin all the time (unless you want it to, this part is unfamiliar territory for me)
4x4 swap:
-some vehicles (like my explorer) have all the brackets ready for 4x4 hardware (to save assembly line costs i assume). find a rig like yours, but 4x4, in a junkyard and grab a tape measure
-install front axle and driveshaft only, no transfer case.
-instead of a transfer case, the front driveshaft connects to your electric motor.
with both setups, my idea is to use electric only (ICE off) for up to a "target speed", say 35 mph. then shift to start gas motor if going faster than that. I like the motor inline with the driveshaft in the video posted above, wonder how that works.
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