Mine is working great after I modified it. My 355 is putting out over 400 H.P. and there was some erratic traction at times. What I did to my unit was to counterbore the spring pockets deeper and install heavier springs, and it has been working great so far. If I had a choice, I would go with a factory LSD, but I got a good deal on my Phantom Grip from a member here and now it is performing great.
Mike D.