The stove receptacle in our kitchen is right next to a cabinet. Because of its position, the stove can't slide all the way back to the wall and sticks out about 4". I have access to the wiring from a hole in the basement ceiling, and there is not much slack in the wire. I tried moving the outlet about 3" to the left so it could be mounted vertically against the baseboard, but the cable won't reach.
Does anyone have suggestions on what I can do to move the outlet? One option I've thought of is to put a junction box in the basement where I can get at the wiring, and add another 1-2' of 6/3g cable. I'm not sure if it's acceptable to splice the 6 guage wire, though. Another option would be to re-run the 6/3 cable from the breaker to the outlet, but most of the basement ceiling is finished with sheetrock and I'm not sure how hard it would be to rerun the cable.
Any help is appreciated. Here's a picture showing the outlet and where the stove goes.
Since you only have three wires going to this existing receptacle you should run a new 4 wire circuit. Mount a new box flush behind the stove. Patch hole in floor. 3 wire range circuits are not allowed.