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