With snow paws on the Vics are unstoppable. Ive never had a problem. Winter has been super light this year, but Ive almost plowed snow in the CVLX before and it has a 2.73 open. Sometimes Ill pop it into manual 2nd to get going easier (4R70W will actually hold 2nd and not do a normal 1-2 like some others) but thats it.
I did have trouble in one spot last year with worn out Perelli P6 on the CVPI after I smoked the trans on the CVLX and had to drive it all winter. It was just ok mostly, but I got stuck on the driveway trying to back into the garage once. I would hit the bump that had built up at the garage door and the rear would shift. My door is small, only about 1-2 inches on each side of the mirrors so I would have to renegotiate. Well, ended up getting stuck. The Traclok wasnt helping, just grinding; too little torque to bind the clutches. (This was right after I had rebuilt it too. I had debated ordering the higher preload F150 clutch spring, but since I thought my brother might drive it, I didnt want it too aggressive.) I tried stomping on the park brake to get some more bias, but Ive never been able to get that adjusted right so it wasnt helping either.
But, since I was at home I had all the tools there so I got it out. Just an annoyance, mainly.
Now it has the Altimax Arctics and its awesome. Sometimes it will kick out which is helped along by the tracloc, but its very controllable, and letting off the throttle will cause the rear to hook back up almost instantly. Very fun.
Had it happen accelerating up a hill, hit some black ice and the butt kicked out. I let off the throttle and it straightened up. I was able to ease back into it and continue up at the 20 or 25 I was already at when it lost traction.