not sure on gearing. all stock 99 500sx, including gears (22/39). do I need to drop a tooth on top to help this sled to turn 7700 w/8ab's and 2.4's in both holes or better to start with less overall rivet weight and stock gears? Guess I'll find out soon enough as soon as parts all arrive and I get it togethor but if lower gear is needed it might as well get done beforehand. I'd like to squeeze at least 85-90 mph out of this sled and dropping gears just seems counterproductive. Dave