RE: Volcano T2 center diff problem
This problem could be either the one way bearing as prostreet said or it could be the slipper setting which the the nut and spring located on the shaft that supports the main gear. If this is set to loose it could be causing this problem, with the car on a flat surface and not running hold the car so that the wheels cannot turn and try to rotate the main gear if it turns and is slipping then you need to tighten it, Ideally you want the gear to be very tough to turn with the wheels locked but with a lot of force it should slip a little because it the slipper is to tight then all the force is put on the internal gears off the transmission.