It may sound really basic, but have you checked the tire pressure on your rears? If one is real off, say from a nail it does screwy thing to your handling.

Former, now returned CEG'er! 95SE MTX, (AKA "The Road Rat"). Stock except for:TH fix, B.A.T. big brake kit, tranny cocktail and lots of re-insulated wiring! May yet be a 3.0! "Speed doesn't kill, stupidity does!"