SCS Professional Series Quick Change Gear Set - 6 Spline - Set 611 - 4.11 Ratio 2.74 / 6.17 - 4.33 Ratio 2.89 / 6.50 Fresh Air System This donut shaped 360 degreee

This donut shaped 360 degreee Helmet Support is used in all pro classes

Fully enclosed epoxy molded electrical coil for reliability

90 Day Limited Warranty

3/4 in Inlet Tube

SCS Professional Series Quick Change Gear Set - 6 Spline - Set 611 - 4.11 Ratio 2.74 / 6.17 - 4.33 Ratio 2.89 / 6.50 Fresh Air System This donut shaped 360 degreeeManufactured from 9310 aircraft alloy for maximum strength, 6 spline quick change gears are crown hobbed, broached for 6 spline shaft fit, and black oxide finished for corrosion protection. Gears undergo a five step heat treating process to deliver maximum durability. Since 1979, SCS Gearbox, Inc. has been listening to it's customers! When SCS Gearbox first started manufacturing, it was to meet the needs of tractor pullers to provide specialized