Is there such a thing as a 5000 stall converter that is streetable ?

what gears are you running 4.88's or lower ?
My 340 cuda has a 8" stalls to 5500 4.10 with 28" tires. The j was in my hemi rr flashed to 5000, 30 inch tires 4.56. Another 340 I had with the j stalled at 4500 if I remember correctly 4.56 maybe 27" tires.