Before I broke my stock tranny I could "powerbrake" and do a burnout pretty easily. Had my tranny built and told them I would prob only be towing with it but wanted support for 500-600 horse. Got tranny in, it tows AWESOME with the smarty but I can't do a burnout to save my life now! At about 2500 rpm it feels like it quits putting power to the ground. Also, if I have the smarty on with my tst it's a rocket but with the tst by itself on any setting the power comes on so hard and fast that my rpms shoot over 2500, my engine is screaming but it don't feel like the power is getting to the ground. I talked to the place that built the tranny and they said they built it for towing like I wanted and I should gain a little mpg and about 500 rpm in overdrive which I have but do I have to give up power on the top end for that? Is the tc stall even the issue or what? I'm confused.