Runing a low gear like the 3.08 doesnt allow the rpm to get high enough to couple. We ran Dizusters turbo car with a 2.76 gear. It ran 10.50's but the slip was as I recall was over 25%. Why? The car wasn't done accelerating. My street car ran a 5300 with a 3.55. Slipped like mad. Felt like it had a V V T trans. Same converter with a 4.30 it drives great on the street. Cam, converter, gear all have to be in sync to drive nice.
Doug