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Well, after more testing, it seems to be a user error. Was able to drive for a good hour today without and bucking/shudders. I think it's a combination of a new clutch and upgraded transmission/rear end that I have to get used to. The car seems to like higher rpms when starting from a stop, and a different clutch engagement that what it was before. Car is much more fun with the new parts. Not a fast car, but a fun one.

**UPDATE Went to court yesterday and basically played dumb. Told the judge that "I went to the state ref and he told me since the car is so old that he couldn't do anything to certify it. So how do I go about taking car of this ticket. The vehicle is a pre smog vehicle so I've never had to SMOG it" The judge said "Ok so what Im going to do here is dismiss the case cuz it seems like your car doesn't qualify for an inspection. Sorry about the inconvenience Mr. Soto" I tried to play it cool but I was so happy. After reading all the horror stories from other people about having to revert to stock and all that I was lucky I guess Hope this thread helps someone going through something similar

Good News, replaced both the front main-shaft and front counter-shaft bearings which solved my grinding problems! So, to recap the project, I am finished installing a 82 280zx transmission, r200 3.9 rear diff, and a new clutch disk and pp. Bad news is that I now have a shudder and a howl noise. The shudder happens when accelerating from a stop. It feels like the diff is grinding/not catching. It seems like the problem does not occur when I keep the revs high when accelerating from a stop. Does not happen in any gear besides 1st. It might just be a user error with me not being used to the new clutch/tranny. I've read that adding some friction modifier helps with this issue in LSD's, but IK this is an open diff. Could that help here? The howling noise I'm pretty sure is transmission related, as it only occurs in 1-3rd gears. It does seem to follow the rpms and go up when accelerating, but disappears in 4th. It is not that loud to begin with though.

I am still around, I don't check regularly. I still have my Z. I joined here when I was 15, I am about to turn 38.