Yes. I mean, it might
be a necessary upgrade for running a big lowered box. They're supposed to take more abuse.
I replaced all of mine last summer, and its not like they're super expensive. I use all moog components.
It's the spindle that's getting hard to find. But, plenty of guys part out 9C1s tho, because they're NOT an impala ss
And drive the f out of them.
Side note: a good shape, low mile 9C1 is gonna be the next big thing once they're all crushed or donked out. The impala ss's days are numbered.