What are the benefits of low gear sets for 3-speed automatics?
One of the most effective improvements that a performance street vehicle can utilize is a lower first gear set for the transmission. When such a 2.75 gear set is installed in a T400, T350, C-4, C-6 TF-727 or TF-904, it allows a conservatively geared 3.50 ratio car to launch with the potential of a 3.90 rear gear. Likewise, when a 4.10 rear ratio is present, the 2.75 low gear allows the car to accelerate with much more aggressive potential of a 4.56. Highway RPM in third gear is unchanged from stock. These gear sets have shown as much as a 3 tenths improvement in overall ET – often half of which occurring in the first 60 feet.
