Kurt is right. Too many people play with the rear suspension thinking that's where the problem is. Is the front isn't working then you'll be chasing your tail forever. You could try some shock extenders on your current shocks. 
Also make sure the control arms can move freely up and down without binding the bushings. If they do bind up you can just loosen the bolts until they can be moved with slight resistance. Just make sure they're tightened fully for everyday driving. If you have a sway bar, disconnect it for the track.
Big slow mud truck with a TUNE!!!!!!