I have had this same problem for like 6 months now, and it seems no one knows how to fix it. I had a B18c1 swap/y1 tranny, and used B serious swap axles.
Now any time I take a semi-hard left turn, The whole car shake and it depend on my speed too. And if I keep cont. on the same speed as it start vibrate, the car is going off the left turn as it vibrates.If I turn slow sometimes it doesn't shake. Also, sometimes it will vibrate when i hit a bump going straight. It sounds horrible. Did anyone had the same problem before?? Please help me. Thanks.

 

might be advisable to check the front suspension for bent control arms. or check to see if your wheel is touching the radius arms while turning.

 

i agree with that

also, i've heard of cheap mounts having poor placement doing similar things to the axles

 

Thank you very much, I will check that out.