What I mean is that a "general" stall rating doesn`t apply as we make more power. A 2400 stall may stall that behind a stock 383 but when you put it behind a 500" bad dog the stall goes up due to the increased torque. I would call a vert company and give them your power, weight, gears etc. and have one built for your needs.....you will NOT be dissapointed.