I have a clunking coming from the rearend of my car when I'm reversing out of parking lots and put the brakes on. I'm thinking it is worn out diff bushings since I'm also noticing extra driveline slop lately.

Can anybody confirm this?

The car is an 04 with 81,000 miles. 4 track days and I chirp 235mm Kumho MX's shifting into 4th gear (not all the time, just to illustrate that I don't take it easy on the car). So, it's driven fairly hard.

 

Left my crystal ball in the car. Are you really asking total strangers to diagnose a potentially serious problem with your car through a vague description (clunking from the rear) of the issue? Let's see a quick video or sound clip of this, and while you're at it, include one of those magic chirps.

 

2004 a/t touring coup had the rear clunking in parking lots and going in and out of forward and reverse
dealer confirmed rear sub frame bolts had loosed off they tightened the bolts for free and problem when away

 

Thanks for the confirmation on my theory.

And welcome to my350z.com!

 

I seem to recall a TSB for a rear-end "clunk" sound.

If it is your diff bushings, SPL parts sells stronger ones that might help:
http://splparts.com/main4/parts/Z33/...me/default.htm

 

I have 81,000 miles on my car right now. I doubt a service bulletin would apply, but those parts are what I will probably be using.

 

have you installed a camber Kit?
had rthe same problem, need to tighten bolts...or a have you had an alignment recently?

 

The suspension is all factory and I haven't had an alignment recently.

Good call and I'll check that also just to be sure.