Hi!
I've looked all over to find a similar problem but I can't seem to find anything. I'll try to explain it all here.
When I floor it in first gear my ebrake shakes erratically, only between 15-23 mph though. it shifts fine into all the other gears but almost feels like a bind or something coming from the back.
I changed my rear axle fluid, checked my cv axles. topped off my transmission fluid, checked engine mounts, and I'm still not sure what's causing it. Not sure if it matters, but my ebrake barely works, it wont stop my car from moving in drive or reverse, but will barely keep it from moving in neutral on a hill.
Any tips or things to troubleshoot would be greatly appreciated.
I've attached a video of what it looks like, mind the little bit of finger in the way.
https://imgur.com/a/nhN8rqz

Thanks
Luke

 

sounds like your drive shaft bearing /and bearing support are bad,,, if you want a new one from chi na go to ebay or get the correct one from needswings
To check it, put the car on a lift ,, after clearing a path use a crow or pry bar to lift and move the drive shaft up and side to side at the support you will see if it is ripped it should only move less than 1/2" in any direction. jim