check inside the tranny to make sure there is a fair amot of grease or lube! my rs4 was the same it would go but it would squeal like a dying cat and i had no control over it, just a little vasaline/patrolium jelly on the gears put the tranny back together, drop in the car and problem was fixed! It could also be the diffs may be to tight and that would cause a squial as well and would also make the car pull to the left or right and spin? This happens on my mini t so make sure ur wheel nuts r not on to tight that can also cause ur problem! are the wheels spinning freely?