my mechanic said there is no movement what so ever and everything seems to be tight.. i can probably snap some pics of it this weekend.. not sure what surface you are talking about..
why did u put white lithium on your bushing before? was it making sounds or u just want to put grease in there to prevent sounds?

I got all the SPL solid bushings installed except for the subframe ones. I'm thinking about it as I was told it will become noisy by a good margin.

just got off the phone with mike from spl... great customer service by the way... anyways.. he had suggest that i use use tri-flow superior lubbricant for squeaky bushings as that is their go to lube for their bushings.. i will try that and update yall

Op do you still have this problem? I have a big thumping noise from the rear as well after my track event. I had spl installed in the rear couple weeks back as well.

I had the same issue on my 350z. Exactly as the OP described it. My diff was moving up and down in the hole where it bolts to the subframe. Just very minor up and down movement that was making a lot of noise. I stuck a washer in there and tightend the bolt back up and it went away. I discovered it by letting a friend drive around a parking lot and I was sitting in the back of the Z with the hatch open, hanging over the rear looking at the suspension while we were moving lol.

yup i still have that sound.

hmm.. when i brought it to a lift.. me and my friend was trying to move everything to check if anything was loose including the diff.. but everything seems like its tight.. maybe ill check again in the spring time when i install my exhaust...

were u able to wiggle your diff by hand?

I don't think so. I think it would move when I jacked the car up by the diff, but I can't say for certain that it did. I'm thinking that the torque while driving was making it move though. You could always do what I did lol.

Another place to check Are the rear hangers for the muffler. When my mechanic installed my diff bushings he had to remove the muffler for clearance and didn't put all the bolts back on the hangers (only 1 per side) and the hangers worked itself loose due to movements in the exhaust system, this is where I discovered where my "clunk" had been coming from. I originally thought it was my rear sway bars endlinks had gone bad and bought new end links to replace it but it was the damn muffler hangers!:rolleyes:

hmm i will do that when my car comes back out the storage.. thanks for the advice! haha

i will b replacing my exhaust next season so i will check up on that too.. it will b nice if it was that tho lol but i doult it since it doesnt clunk on bumps.. just when im shifting or releasing the clutch fast..