I've got 135k miles on my G35. Nothing has been done to it outside of tire work, brake work, and oil changes. I've discovered my Lower Control Arm Bushings are shot. I want to do some suspension work and a possible switch to 350z struts/shocks/springs. I'll be using this link as a guide for what parts I need to rebuild.

https://g35driver.com/forums/brakes-...ion-parts.html

My only question is: How can I find out how to check these components before just wasting the money on them? If parts do not need to be replaced, I do not plan on replacing them.

 

Depends, are you mechanically inclined to check yourself?

If not, best to go take a visit to a trustworthy mechanic, have him drive the car and then put it on a lift to isolate what needs to be worked on.