Ok, ive got a 75 Camaro gettinga 500hp/550ftlb sb406. Ive been running a built TH350 with a 3.73 rear. I would like to go to an AOD and go with a 4.11 or 4.56 rear gear but ive heard that alot of the AOD's are weaker than the TH350. My question is out of a 700r4,4l60,and 4l80 which would be the strongest? And is there anything in particular i can have done to them to really make em last? Any help appreciated. Thanks