Get ready to break parts. I have gone through 3 posi units and 6 or 7 sets of gears. After the 3rd posi unit took a dump I went to a spool, hence, no Auto-X anymore. Took out a drive shaft, snapped two toque arms, broke an axle...
I guess dumping the clutch at 7,000RPM on a 28" tall 10.5"...