I've got an 08 350z and I seem to have some slop in my drivetrain. When going from engine braking to accelerating, there's a smidgen of a surge like there is some slack in the drivetrain that is being taken up. Also, when cruising around 2k in third I notice it sometimes "bucks" a little bit, like it's hitting this slack and bouncing off. It seemed to have gone away after installing my new clutch and solid flywheel, but come back slightly. I recently installed a jwt clutch and flywheel and wonder if maybe it's just the dampening Springs in the clutch disk wearing in and becoming a little softer. I was also thinking maybe worn u joints or possibly even weak shock absorbers (more thinking of the bucking on that one). Any advice would be appreciated

 

rear diff bushing, check it... if you have black jizz on the rear subframe below it... its blown

 

pic for visual reference



**edit, wtf does he have a bungee cord on the exhaust (i got the image from googling it)

 

I second the diff bushing and recommend whiteline if its blown.

Looks like it's in the process of disassembly/assembly as the bolts are out of that exhaust section.