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What kind of motors are available that mount to the trans tailshaft?
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There are double ended shaft motors. One that comes to mind is the
Warp 9 Motor 32.2HP. But it's series wound (no regen) and you'd have to make your own adapters to connect it to your transmission and driveshaft.
Maybe I'm wrong, but I would think that a chain drive from the motor to a sprocket welded to the U joint on the transmission output shaft would be the easiest route. Then, as long as you have room, you could just put a sprocket on any electric motor you so desire and weld up some brackets to hold it in place.
But again, if you want a little 48hp motor you'd have to use a very small sprocket on the motor and a very large one on the drive shaft to give it enough torque (geared down) to move the truck. But then it would explode from over-revving at higher speeds unless you have a way of disconnecting the motor from the driveshaft.
Maybe meet in the middle with something like this:
https://www.kellycontroller.com/shop/mars-0913/
It's got 30kW peak power at 96V and could power your truck at low speeds while being geared to the drive line high enough so as not to over-rev and explode at higher speeds. It could also regen for you at higher speeds.
On the other hand I did see this motor, also a Warp 9, with a u-joint output shaft:
https://www.electriccarpartscompany....-9-ev-dc-motor This motor could possibly be mounted in place of the transfer case to the front axle with less modification than any other motor that I know of. It is also double ended so if you did have a machinist make an adapter you could mount it on a 2WD truck to the transmission and connect your drive shaft to it.