Well before you say this trans doesn't hold up to power just let me run down the life of this particular T56. The trans is the stocker from my car with 49K on it. Car was 570-600+ HP whipple car for 5 years and a turbo car making 740/754 all last year and about a month of this season. I powershifted this trans everytime I raced the car. it had over 100+ track passes on it over that time frame. It had been launched at 4500-6000 rpms MANY MANY times. up until the moment it let loose it still shifted like butter and I honest think I have miss 2 gears in the 7 years I had it. for a 450 FT/TQ rating these trans are more than impressive. I bet if I was still whippled this trans would be still ticking.
So these pics came for my buddy who pull the trans for me at his shop. Not super knowleagable on transmission internals. From what he told me was the input shaft was in as bad of shape as this gear pictured but everything else from there back seemed OK.
But time to upgrade and NO i am not going auto. I am ordering a t56 magnum tomorrow, should be able to handle the power no problem.