Help diagnosing driveshaft vibration

[grantmiller1]

Thanks, I'll check on those. I have new trans mounts on order. I'll double check my engine mount bolts to make sure they're secure. I re-torqued my trans mount bolts recently with no change.
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[grantmiller1]

The vibration is more pronounced when I accelerate. When i let off the gas, the vibration is noticeably less.

I'll see about getting a digital angle measurement tool.

I have...

[grantmiller1]

I'm not seeing a set of trans mounts from Rouge Engineering for E30's ??

I have the common getrag rattle, so maybe that's the source of the vibration?

The trans output is pretty...

[grantmiller1]

That's the part I'm hung up on. One would think that a new driveshaft that's been balanced, new u-joints, new CSB, new guibo would have less vibration.


The true test I guess is installing...

[grantmiller1]

The poly mounts for the transmission were installed Jan 2018, same time I removed the driveshaft vibration damper, converted to a DSSR shifter....

[grantmiller1]

I'm coming from Burlington / Bayview. I'll probably head out at 8AM.

[grantmiller1]

Yes, the vibration through the gearshift is just what I'm feeling when my hand is on it. The gearshift is not wobbling. This is very likely normal, but I mentioned it anyways.

I installed...

[grantmiller1]

I re-torqued the trans bushing bolts to the correct spec 9-12 ft-lb and took some pictures of the trans mount for y'all.


Confirmed that 3rd gear @ 70 MPH has no vibration.
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[grantmiller1]

Sorry for the delay. Drove around today to gather some info.


1st gear @ 5000 RPM has no vibration

2nd gear up a steep hill has a little vibration (maybe 2 on a scale...

[grantmiller1]

That one did occur to me. I had assumed that it was replaced on the new driveshaft, but all options are on the table at this point. I happen to have one that I'll put in....

[grantmiller1]

1st gear and redline, I think there's no vibration, but I'm going to check this and the steep hill test tomorrow and report back. Thanks!...

[grantmiller1]

I guess that's good to hear? hahah I do have a rattle when in neutral, getting the trans input bearing has been on my list. Guess that just jumped up to the top of the list!...

[grantmiller1]

I'm trying to nail down a vibration while driving on the freeway, hoping for some tips.

First, some backstory:

I have a 89 325i manual trans. I have one of the oddball cars with...