PRO GEARS 9.5" 4.29:1 RATIO 35 SPLINE 79-0098-1

Cheap ring-and-pinion sets cut corners on tooth geometry and case hardening depth — both show up quickly under sustained track use. The Aeroflow 4.29 is built to a spec that holds up across heat cycles, not just on the dyno. At this ratio and spline count, it suits high-torque applications where a stock or economy unit would be the weakest link in the drivetrain.