My car's alignment was way off. When the service techs attempted a front end alignment it continued to pull very hard and steering was difficult. The subframe where the rack and pinion steering mounts connect is severely cracked.

Is the subframe mount something I can replace, or is the car toast?

 

the car is not toast but you walet will be if you want to fix it ... if not sell it for parts like idid

these cars now in days are cheap

 

If you are planning on buying a swap soon, then have the place include the subframe too, its their trash...and your treasure. Or buy a complete front clip (half-cut) or find someone who bought one and ask them if they are gonna use the subframe