If i change my old 2.73 rear to a 3.73 Posi with my set up listed in my signature, will it hold up to the 400+ HP i am trying to get. Or should i just wait another couple months and save for a 12 bolt?

 

From what I've read on this board, 7.5" 10 bolt rears are good until you hit mid 11's. After that, it seems people have had problems with the ring gear breaking. With your combo, you'd probably be borderline on pushing the limits of the 10 bolt, although you're not going to be making an insane amount of torque, or hitting it as hard with the 700R4 as opposed to a stick car, where it all hits at once (drag strip)