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How much tire pressure are you running? You likely have the tire pressure to low.

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do you by chance have a picture of the ladder bar set up on your car? Sounds kinda like the rear suspension may be moving side to side like the locating device is loose or something may be failing. Has it done this all year or been getting worse?

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What tires are you running? What kind of track locator are you using on the car? diagnal or wish bone and does it have rod ends, urethane bushings, solid rod ends?

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Does he need to counter-steer or does the back just wiggle? What sort of ET/MPH we talking here? What size wheel and tire package in the back?

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Are you sure it is in the back of the car you are actually feeling it? Not control arm bushings or alignment that is bad. If it wasn't doing it at the begining of the year and it is now then something is wearing down or broken. I would jack the car up and unload the rear suspension and recheck the diagonal and rod ends on the ladder bars. Also is the diagonal held on by bolt in mounts that attach to the brackets or are they weld on mounts? If they are the bent bolt on type they may be shifting down track creating this problem.

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Yes, it is the bolt in brackets. I will pull it out of the trailer and get her in the air to see whats moving. Someone else told me they put the light weights on a Monte Carlo and it tried to get on the roof when he tried to stop it. Others say they have had zero problems from them.

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Mine acted just like that for quite a while. It would go down the track straight (pretty much anyway) - then when you backed out of the throttle it would get seriously upset. I thought it was my tires or something - but took a pass on street tires and it still did it. Everything appeared tight and didn't look like anything had moved. I measured it and the rearend was out of square. I'm on leaf springs and it actually ripped the locater hole in the spring pad to move itself out of square. It was off by 1/4".

Once I got it all squared-up it drove fine again.

It won't cost anything to put a tape on it. Have somebody help you measure diagonally from corner to corner, and if it's off it will show up quickly.

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A radial willy typically have a stiffer sidewall than a bias drag slick so you should have less rock from the sidewalls with the tire you are running. you should also pull the bolts out on the locator and the front mounts to make sure that the bolt has been eating away at the brackets because the bolt is to short. If the hole is oblonged then that will cause exactly what you have going on. The "kit" ladder bar and 4 link systems typically have too short of bolts in them. The shoulder of the bolt should go all the way through both sides of the bracket and use washers to keep the nut from bottoming out on the bolt before everything is tight.

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I never meant for it to run this fast..

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Oh the heart break!

Thats what we all say. Well maybe not. We mostly say I think there is a little more there! Let us know what you find. One other thing. When you get on the brakes does it feel like on side of the front is dropping further then the other? If the shocks are not equal it can have the same affect.