Weird vibration under throttle

[HennaE30]

If the bolts were reused you could be missing one. I have been told they should be considered 1 time use.
It is something you would notice under acceleration, as that would be when it is most likely to flex. I have had 2 different e30s now that have either lost or broken a drive shaft bolt on the transmission side and under acceleration there is noticeable vibration, but at cruising speed there is nothing. First time it happened to me It was after a hard 1-2 shift going onto a county highway and I didn't know anything was wrong until I came to a stop light and went to accelerate. 2nd car was pretty much same situation, drove it a little hard, get off the highway and to the stop light, go to take off and noticed a little vibration, the harder I got on it the more vibration there was, but once at speed nothing (pulled it in the garage, immediately jacked it up, and sure enough lost a drive shaft bolt transmission side).

New hardware used on guibo, managed to get the car on jackstands in an attempt to diagnose a transmission leak that I'm having and all the guibo/driveshaft bolts (both tranny and diff sides) are still there and intact.

[Helltime]

Guibo was changed in May, less than 3k on it but wouldn't that be speed related? Not load/rpm related? That is why I think it is engine related... It runs great and all, just the vibration under load

If the bolts were reused you could be missing one. I have been told they should be considered 1 time use.
It is something you would notice under acceleration, as that would be when it is most likely to flex. I have had 2 different e30s now that have either lost or broken a drive shaft bolt on the transmission side and under acceleration there is noticeable vibration, but at cruising speed there is nothing. First time it happened to me It was after a hard 1-2 shift going onto a county highway and I didn't know anything was wrong until I came to a stop light and went to accelerate. 2nd car was pretty much same situation, drove it a little hard, get off the highway and to the stop light, go to take off and noticed a little vibration, the harder I got on it the more vibration there was, but once at speed nothing (pulled it in the garage, immediately jacked it up, and sure enough lost a drive shaft bolt transmission side).

[HennaE30]

Weird vibration under throttle

Make sure all of your drive shaft bolts are still there. Ever looked at the guibo to make sure its not worn?

Guibo was changed in May, less than 3k on it but wouldn't that be speed related? Not load/rpm related? That is why I think it is engine related... It runs great and all, just the vibration under load

[Helltime]

Make sure all of your drive shaft bolts are still there. Ever looked at the guibo to make sure its not worn?

[HennaE30]

There is a weird vibration under 1/2 throttle or more. Mostly noticeable in 3rd 4th and 5th between 2000-3000rpm.

i was thinking maybe it is an exhaust leak, because its a horrendous drone/vibration. But i thought id post it in here because its more encompassing.

Any ideas on what it might be?

84 325e btw

edit: it also just had motor tranny mounts done in December if that helps at all.