What was your rpm going through the traps? sounds like a fuel problem to me.what kind of fuel pump etc set up do you have? i think your gear is fine. i run 125 in the 1/4 with a 4.30 gear and a 28 inch tall M/T 275/60/15 drag radial. now i think my car would be faster with a set of 4.10, but when i get my duster going i am going to a set of the M/T 29.5x11.5x15 slick like the op has. OK a question for the op what size and back spacing rear wheel are you running on your duster?