Shaving weight has always been a staple for cutting elapsed times at the drag strip. The simple math works out as a given amount of power can theoretically push a lesser amount of weight at a higher rate of speed than it can push a greater amount of weight. This is called power-to-weight ratio.
However, it’s important to keep in mind that a whole bunch of horsepower is no good if it can’t get moving. Tires and traction must be able to get that oomph transferred to the ground in order for a large power-to-weight ratio to be truly effective. Sometimes strategically adding weight in the right place can actually lower elapsed times by improving weight distribution, weight transfer at launch, and, therefore, traction.
“It’s not what you weigh, it’s where you weigh,” says Rick Johnson, President and CEO of Gear Vendors. The Super Stock guys had that figured out a long time ago when they started moving batteries from the engine bay to the trunk. A Gear Vendors Under/Overdrive works in the same vein since its placement in the back of the transmission tunnel usually ends up moving the center of gravity further towards the rear of the car.
More rear weight bias equates to more rear tire traction which, in turn, improves sixty-foot times. Couple that with the ability to gear split, a 0.78:1 overdrive, plus a thirty day money back guarantee that rarely sees returns and adding a Gear Vendors Under/Overdrive looks positively power-inducing.