Transmission leak on 2010 Ford E-150

On the back of my transmission where the drive shaft connects, there is a black knob (with wires) that twists into the transmission. Does anyone know what this thing is called? It has a nice leak coming from it and I am assuming that it is a gasket.

by in Valencia, CA on November 10, 2012
Get Your Car Fixed at a RepairPal Certified Shop.
We certify shops based on expertise, quality work, and verified customer reviews
1 answer 1 comment
ANSWER by , November 11, 2012
electrical bulkhead
COMMENT by , November 11, 2012
Is it hard to replace? I saw a post where it said I had to drop the pan, and replace the O-Ring on the inside. Seems pretty easy. Any advice?