So recently baught a 2006 350z grand touring with a lsd diff. I replaced the clutch with a stage 2 and the flywheel with a single disk. I had to make a new slave cylinder arm for the clutch because the oem one was to small. Now I ran into a weird problem. I'll turn off VDC and when I'm in a low gear and get the tires spinning the rear end will kind of shake or made a repeating loud slamming noise and this never happens unless the tires spin. I replaced the diff fluids but it still happens. The only other solution I can think of is on the slave cylinder arm that I made I think I made it a little to long and there no play so could it be something with the clutch? If it's not that the my next step is to get new diff gears which is like $1000! Any ideas?

Sorry I posted it in the wrong place and I couldn't figure out how to delete the older one

Yeah it happens with VDC on but it's prob just trying to stop the rear from spinning in the first place. Idk about the ECM I'm still kind of a beginner at this stuff it's my first "project" car. I used a normal bolt and I cut the top and thread off and rounded the ends so it look pretty identical to the oem one just like a half inch longer. I can't get pics because I'm in school right now.

You can’t see it that well because I’m having troubles getting the rubber off but that silver rod is what I made because the single disk I put in made me need more length the engage the clutch

I try to drive normal because I don't wanna wreck anything but it happens even when in driving around a corner and the back kicks a little