SergntMac
I agree, the wide, summer tires that come standard on the MM aren't the way to go in snow. That's why I said "winter tires" when I posted that an MM should work fine in snow. The Grand Marquis my wife drives does have the 3.55 rear end, and I suspect that its part-throtle torque at 1500 rpm isn't much (if any) different than the MM's. In fact the standard engine's torque may be higher at this rpm----------and if you're trying to launch in snow at much higher rpm's, all I can say is that I think we've found the problem with some people's ability to drive in snow!!!!!!!!!
I haven't measured the actual difference in front spoiler clearance, and that could make a difference, but I suspect that, if the MM is designed to make it into gas stations without tearing up the spoiler, that its front clearance isn't much different than a standard Grand Marquis either.
Like I said before, given winter tires (and maybe a little trunk ballast), the MM should be just fine in snow---------if its driver has any skills.