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I have an 02 GT with the mods listed in my sig.
When I am on my way home from work there is a 90 degree right hand turn I make and through the turn it feels like the car starts to have body roll then the tires slip, car levels out then starts to roll and the whole thing starts over. It is over very quick but it's like roll slip level, roll slip level,roll slip level.

Things I have considered that may be at fault.
Crappy OE tires.
lack of proper alignment with the CC plates, tech who did it said he put as much negative camber as he could and gave it an aggresive tow(sp?)
Need of a bumpsteer kit to compensate for CC plates and lowered springs.
 

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If you want to find out if you have a bump steer problem you could look at your tie rod angle in relation to the angle of your control arm. They should be close to parallel. If you really want to do it right. Do a search, and build your own bump steer guage. With the car being lowered you really should get a BS kit.
 

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i say yes to all. It's pretty rare that you can point at one item as the entire problem. Lousy tires will make a really big difference to how your car handles. Too much toe can make initial turn-in exaggerated - i could see that causing a little slip if the rest of the suspension can't keep up. As to the dreaded bump steer, if you review some of the animations of our suspensions in motion, i think you can better recognize the conditions that encourage steering inaccuracies (this one doesn't show the control arm, tie rod relation ship - but it's still one of my favorite sites when i'm trying to picture in my brain what's happening beneath us.)

http://www.miracerros.com/mustang/t_suspension2.htm
 

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It sounds to me that the tires are rolling over on the sidewalls. Creating the roll/slip feeling. As they recover and the tread comes back in contact with the road it will feel like grip is back. Check your sidewalls and see if there is scuff marks. Add a few pounds of air pressure and see if the problem gets better. But I doubt you will totally overcome it with OE tires.

ps: It also sounds like a classic case of overdriving a turn. You might be going to fast on entry.
 
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