bluecmaro96

im sorry i dont have too much knowledge when it comes to this, i dont have any experience with this so please bare with me, why do people go from a 4l60e to a th400 or other tranny? how fast are the ones who swapped out different trannys? what will the 4l60 e handle as far as hp? couldnt i get a 4l60 e from somewhere who upgrades them? what can those ones typically handle as far as hp? thanks guys i want to keep my car street legal