[gpetilli]

SandDrag is correct - it is a Banebots CIM-U-lator. That particular gearbox had a serious design flaw. The small 550 and 775 motors have active cooling and use a fan to draw air in from the front vents, blow it past the armature and out vents near the rear. That gearbox covered the intake vents and motors burned up. The original 775 motors got a bad reputation for being unreliable when the real issue was this specific gearbox.

There was a modification (proposed by Andy Baker if I remember) that milled slots in the mounting surface to allow air to the vents. From the picture, it does not look like your geabox has been modified. Otherwise a fine gearbox - Vex and Andymark both have similar gearboxes which have air vents by design if you dont have the ability to modify the one you have.