If any one can help me, when I make a right turn about 90degree corner and my car starting to wabeling on the back about 40mph. I'm not sure i think is the shock but give me some advise.

 

wabeling????

I have no idea what you're trying to describe....

 

If you are making a 90 degree turn @ 40mph and your rear end is doing goofy stuff, it is pobabally because at that speed the car is sliding sideways. Don't worry you are just about to pull a bit of drift action into the curb .

 

Unless you're on a perfectly flat surface, like a skidpad, your tires would move with the road, bumpity bump.

I guess you could get a bigger rear swaybar to try and keep them planted. If you go around corners at 40MPH all the time, then I'm sure you can handle it!!

 

Sorry ... Sounds too vague and hard to diagnose here

Could be something simple as uneven tire, unbalanced tire, alignment issue ... all the way to a bend frame or blown shock

Take it to a trust worthy mechanic or even another member here for a ride (or ask them to drive your car) ... good luck