Here is a shot of my Aveox 27 series motor with the Maxon 4.4:1 in-line gearbox.

My ESC didn't come with any motor wires so I soldered on some Trinity R/C car battery connectors.

The Aveox SL-48 only has BEC up to 10 cells and I am using 16 cells so I needed to purchase an Ultimate BEC from [link=http://www.hobby-lobby.com/ubec.htm]Hobby Lobby[/link]. The UBEC weighs less than an ounce and powers the receiver and servos right from the main flight pack...up to 29 or 37 cells depending upon the version.