Ok guys I am in the process of building a 4mill with herrs full drag port. Never had or rode a 4mill before so really don't know what to expect. Can I run a lock up on a stock transmission? It has only the shift star mod, atf fluid, pancake brg and cleaned up the drum a little but nothing else. Do I need a lock up ( i run asphalt drag) and other than a cover what do I need? Will a stock clutch hold a 4 mill? I do have a steel carrier not aluminum. Thanks