Welcome to Ecomodder. Jumping right into the deep end of the pool?
Consider the ways to your goal.
- A mild hybrid would have an altermotor on the internal combustion engine. Easiest but no creeping around parking lots.
- A conventional hybrid would put an electric motor in the drivetrain. Prius and Chevy trucks integrate into the transmission. Aftermarket units replace a tailshaft.
- Replacing a transfer case with an electric motor creates a through-the-road hybrid with two separated powertrains.
Bolting a motor directly to a solid axle would be sub-optimal.
Have you looked around here much? Here's the altermotor:
ecomodder.com/forum/showthread.php/controller-mods-build-e-assist-altermotor-35003.html. 15-20 horsespower at 55 to 72 Volts.
And here's an electric axle:
ecomodder.com/forum/showthread.php/hot-rodding-toyota-mgr-29878.html. 98 pounds and 68 horsepowers.
I actually have a Lexus axle, but it wants higher voltages, maybe 400V.
The actual build process would start with a scoping statement and use case.