Step 3: Adapter plate
We will use the car's original transmission as a way to connect power from the electric motor to the car's wheels.
The trick here is how to attach the motor to the transmission?
We will make an "adapter plate" out of a chunk of plate aluminum which has holes in it to line up with both the transmission and the end of the motor.
I pulled the transmission out of the car, and flopped it on some tagboard, then outlined it in pencil and marked all the holes.
I then took that and the motor end cap to a local machinist who is also a hot-rodder and knows way more about cars than I do.
He cut an aluminum plate to the size and shape required, complete with carefully aligned holes. The center of the motor drive shaft and the center of the transmission driven shaft need to line up perfectly.
Before bolting the motor and transmission together with the adapter plate, we need to design a coupler that will mechanically connect both drive-shafts.