Y12 Subframe Bushings Questions

[Premera]

SO I'm in the market for subframe bushings, top shock mounts and steering couplings and wanted to know if the bushings can be changed OR if I need to change the entire sub frame ?

What are the pros and cons of replacing the bushings and or the entire sub frame ?

Take into consideration I runnin 20's on 225 x 30 x 20 and the car is seldom driven as well.

[r.smith]

There's a mechanic on the highway just before coca cola they had made and replaced a friends of mine sub bushings with a polly bushings and it solved the problem