Your correct maybe I should raise my rates, and I/we don't run 5.86 gears, the car that the engine is in is a 3,330 lbs street Duster full glass and steel doors, stock suspension as produced. Yes we stepped the gear up to a 4.86 but we also run 30" tall tires 10.5 wide, so a 4.10 and a 28" would work out the same. Oh and for hedders we have the 1 5/8" shortys with a 2 1/2" tubing through free flowing exh., I hope this equates to a street car.