I've heard this is a common one for G owners. After my last oil change, Infiniti let me know my rear subframe bushings are broken and they wanted to charge me $1400 to do it. After a little bit or searching around I've found some kits I could buy for cheaper, though I'm not sure sure if I've found the correct ones.

https://www.z1motorsports.com/suspen...37-p-7516.html

https://conceptzperformance.com/whit...994_p_8189.php

If both work, I think I would prefer the solid ones for durability. This is for a 2011 g37x coupe. Thank you for taking the time to read this!

Edit: Moved to correct area.

 

Late reply so you may have already decided, but either will work. In general, the rears of coupes, sedans, and Z's are pretty interchangeable as far as parts go. Obviously there's some exceptions to that. Yes, either of those will work for your coupe. Solid bushing may cause some NVH though, so keep that in mind. I personally would go with the Poly. I believe our stocks are rubber for comfort, but obviously wear much quicker. Poly is a good middle ground, unless you're trying to go full racecar or don't mind the added NVH.

 

Yeah I just ended up getting the collars from z1 to put around the oem bushings.

 

The collars do not go into the main subframe/diff. Fyi

 

Yeah they are going on the rear subframe.

 

You blew the diff bushing no? Subframe collars do not address that. You'll need a new diff bushing separately.

 

This post has nothing to do with diff bushings.

 

The exterior subframe bushings don't go bad.
the main diff bushing that's in the subframe does commonly go bad. Its not sold from dealer separately thats why you got a 1400 dollar quote. Thats to replace the entire subframe.
so I believe you bought the collars thinking thats your problem but it's not going to fix your issue as the the problem lies in the main subframe bushing that holds the diff. Youll need to cut that out after dropping the diff and press in a new one or buy a new subframe

 

Yeah I have since just replaced them with new oem bushings and putting on the collars next week. I do want to replace the diff bushings as you are right, its a common point of weakness. I just need to do some research on brands, lifespan etc.

 

replace the trans diff and motor mounts. All old ones will start to go faster with newer ones you changed