It only has 4.56 gears but its a T18 tranny with a 6.5:1 granny gear and a 300+ horse 351. They will spin enough to throw up 40 foot mud roosts.
And yes, these tires are ridiculously loud on the street. The truck has 3" headers, glass pack, and 3" turn down. About 4 feet of total exhaust length, and you can hear the tires coming down the road before the engine.