Have you had it aligned since the "mishap" ?
The post-alignment numbers (Camber/Caster/Toe) will give you an idea/starting point as to what is causing the wear problem . . . .
About a year ago I tagged a median...
I think thats the best explanation of what is causing the wear...HA...

I crack myself up.....
but being serious....If he did hit the curb off enough to cause teh motor to sit higher in the engine bay....it bet he is having all 3 problems...
but I can offer some advice how the best way to fix it..that is after you find a MTX subframe (has to be from a 5 speed taurus though.)
Any way, the best way I can describe to fix it is to find a really big piece of metal (some thing that stretches from one strut tower to the other, I was using a piece of 4x4 tubing along with 2 piece's of 4x4 lumber so I wouldn't mess the body up, Snap on also sells something like this that is made to do exactly what I am describing...but I am to cheap to buy it.)
with doing it the way above....if you get the chain that wraps around the bar/tube/whatever to be pretty tight to begin with, when you go to drop the sub frame, the engine won't move out from the engine bay far.. and with that, you won't have to unhook nearly anything to do this...
but if you do it the above way (if you can understand my terrible use of the english language and the way I describe things) you will just have to unhook the motor/tranny mounts, Cruise system, PS cooler, rack and pinion, and the control arms from the knuckles and the subframe will brasically drop out of the car.. and I usually wait on unhooking the sway bar untill I lower that subframe, that way I can unhook it directly from the subframe and don't have to worry about even touching the front sway bar links that NEVER come off in one piece.
hopefully my terrible description help you.